Commit Graph

295 Commits

Author SHA1 Message Date
Ian Lance Taylor 99fa49e4b7 lib/time, time/tzdata: update to 2021e
Doing this a little early in the release cycle as there have been some
changes in the handling of old timezones. They should continue to
work as expected, but more testing time may be useful.

For #22487

Change-Id: I3686fed79a052c46112445055044cff5842f2a45
Reviewed-on: https://go-review.googlesource.com/c/go/+/362874
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
2021-11-11 05:16:39 +00:00
zhouguangyuan 90462dfc3a time: fix looking for zone offset when date is close to a zone transition
The old implement passed start - 1 or end in func lookup to adjust the offset.But if the time is close to the last zoneTrans, like the issue, testcase and comment, the "start" from lookup will be omega. It can't be adjusted correctly.

Fixes #49284

Change-Id: Ibaf82dc4db6d5dd3279796f003d2b19c38a26341
Reviewed-on: https://go-review.googlesource.com/c/go/+/360616
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Robert Findley <rfindley@google.com>
2021-11-05 21:28:34 +00:00
jiahua wang ad6ce55a55 time: add some examples
Change-Id: I2668cdea64f75bee87d424730d404834d69362a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/357270
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Cherry Mui <cherryyz@google.com>
2021-11-05 21:28:07 +00:00
zhouguangyuan 091948a55f time: make Ticker.Reset(0) panic
Fixes #49315

Change-Id: I0887bad1059b25ae0749bfa1ed6ddccbecca7951
Reviewed-on: https://go-review.googlesource.com/c/go/+/361074
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
2021-11-05 21:13:38 +00:00
Russ Cox f229e7031a all: go fix -fix=buildtag std cmd (except for bootstrap deps, vendor)
When these packages are released as part of Go 1.18,
Go 1.16 will no longer be supported, so we can remove
the +build tags in these files.

Ran go fix -fix=buildtag std cmd and then reverted the bootstrapDirs
as defined in src/cmd/dist/buildtool.go, which need to continue
to build with Go 1.4 for now.

Also reverted src/vendor and src/cmd/vendor, which will need
to be updated in their own repos first.

Manual changes in runtime/pprof/mprof_test.go to adjust line numbers.

For #41184.

Change-Id: Ic0f93f7091295b6abc76ed5cd6e6746e1280861e
Reviewed-on: https://go-review.googlesource.com/c/go/+/344955
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-10-28 18:17:57 +00:00
Meng Zhuo 5b9206f64e time: allow minimum int64 in ParseDuration
ParseDuration should handle minimum int64 (-1<<63) nanosecond
since type Duration is alias of int64

name           old time/op  new time/op  delta
ParseDuration  91.4ns ± 0%  86.4ns ± 1%  -5.49%  (p=0.000 n=9+8)

Fixes: #48629
Change-Id: I81b7035b25cefb4c1e5b7801c20f2d335e29358a
Reviewed-on: https://go-review.googlesource.com/c/go/+/352269
Trust: Meng Zhuo <mzh@golangcn.org>
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-10-08 14:08:12 +00:00
Damien Neil 4ffa2f1c23 time: fallback to slower TestTicker test after one failure
TestTicker is sensitive to overloaded or slow systems, where a 20ms
ticker running for 10 ticks has a total run time out of the range
[110ms, 290ms]. To counter this flakiness, it tries five times to
get a successful result. This is insufficient--an overloaded test
machine can introduce more than 100ms of delay across the test.

Reduce the five attempts to two, but use a 1s ticker for 8 ticks
in the second attempt.

Updates #46474.
Updates #35692.

Change-Id: Ibd5187b00ccceeb981b652f2af9a1c3766357b78
Reviewed-on: https://go-review.googlesource.com/c/go/+/339892
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-10-06 23:01:01 +00:00
Alexander Yastrebov e38ec96c69 time: truncate fractional seconds longer than 9 digits
Fixes #48685

Change-Id: Id246708878c2902b407ab759537f6b545a1f459f
GitHub-Last-Rev: 4d985192c5
GitHub-Pull-Request: golang/go#48750
Reviewed-on: https://go-review.googlesource.com/c/go/+/353713
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
2021-10-06 19:45:35 +00:00
Leigh McCulloch 6b0026ae31 time: add doc comment about tzdata package
Add doc comment about the time/tzdata package to the time.LoadLocation
function. The time.LoadLocation function was changed in Go 1.15 to add an extra
source that it considers for the time zone database. That location is the
time/tzdata package. It is not easy to discover this behavior because the
documentation for the time package doesn't mention it in the discussion on the
time.LoadLocation function when discussing the different sources. It would be helpful to
describe all possible sources that time.LoadLocation considers when loading the
time zone database, and so I think it would be worthwhile to mention
time/tzdata.

Change-Id: I408fbe188bf9d4ba797e59ec17eb677136d6a9c2
GitHub-Last-Rev: 3dac204326
GitHub-Pull-Request: golang/go#48673
Reviewed-on: https://go-review.googlesource.com/c/go/+/352830
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Heschi Kreinick <heschi@google.com>
2021-09-30 15:03:39 +00:00
Riley Avron 163871feb1 time: re-add space-padded day of year to docs
CL 320252 reworked the time docs, but accidentally deleted the format __2
from the sentence describing the three-character day of year component.

Change-Id: I3f583733028657c2a677358a25e062ea81835ce8
GitHub-Last-Rev: 2fa9832419
GitHub-Pull-Request: golang/go#48387
Reviewed-on: https://go-review.googlesource.com/c/go/+/349929
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Carlos Amedee <carlos@golang.org>
2021-09-17 23:19:17 +00:00
HowJMay ac7c34767d time: support fractional timezone minutes in MarshalBinary
If the time is in 'LMT' and has fractional minute, then
`MarshalBinary()` and `UnmarshalBinary()` will encode/decode the time
in `timeBinaryVersionV2` in which the fractional minute is at
bit 15 and 16, and presented in seconds.

Fixes #39616

Change-Id: Ib762fb5fa26f54b1a8377a5dde0b994dd5a1236a
GitHub-Last-Rev: 455d7a2496
GitHub-Pull-Request: golang/go#40293
Reviewed-on: https://go-review.googlesource.com/c/go/+/243402
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Carlos Amedee <carlos@golang.org>
2021-09-17 23:18:47 +00:00
Ian Lance Taylor 2da3375e9b runtime: in adjustTimers back up as far as necessary
When the adjustTimers function removed a timer it assumed it was
sufficient to continue the heap traversal at that position.
However, in some cases a timer will be moved to an earlier
position in the heap. If that timer is timerModifiedEarlier,
that can leave timerModifiedEarliest not correctly representing
the earlier such timer.

Fix the problem by restarting the heap traversal at the earliest
changed position.

Fixes #47762

Change-Id: I152bbe62793ee40a680baf49967bcb89b1f94764
Reviewed-on: https://go-review.googlesource.com/c/go/+/343882
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2021-09-15 00:56:40 +00:00
Alexander Melentyev 4a4221e818 all: remove some unused code
Change-Id: I519b8021fa79dccc5c0ee79134547491116fc4cc
GitHub-Last-Rev: 48869f5434
GitHub-Pull-Request: golang/go#48071
Reviewed-on: https://go-review.googlesource.com/c/go/+/346231
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Keith Randall <khr@golang.org>
2021-09-14 00:49:39 +00:00
Josh Bleecher Snyder 5a4b9f9494 time: reference -tags=timetzdata in testing panic
This will spare anyone who hits it having to search for the workaround.

Change-Id: Iff0d449212f2675ac78e30ae5ffc8efb4d924088
Reviewed-on: https://go-review.googlesource.com/c/go/+/334611
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-09-10 17:11:39 +00:00
korzhao e1c3f2158f time: propagate "," separator for fractional seconds into Format
In CL 300996 that fixed issue #6189, we made Parse recognize
"," as a separator for fractional seconds.
However, we didn't modify Format to propagate the separator
verbatim from Parse. Without this change, we break prior
functionality that relied on a comma being used in Format.

Fixes #48037

Change-Id: I6565a25e8657ca3747a58b25acba58f27cdcddc0
Reviewed-on: https://go-review.googlesource.com/c/go/+/345438
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Cherry Mui <cherryyz@google.com>
2021-09-09 22:17:48 +00:00
korzhao d2f002cb39 time/format: avoid growslice in time.String()/time.GoString()
Pre-allocate the slice of buf with enough capacity
to avoid growslice calls.

benchmark                   old ns/op     new ns/op     delta
BenchmarkTimeString-4       493           409           -17.12%
BenchmarkTimeGoString-4     309           182           -41.30%

benchmark                   old allocs     new allocs     delta
BenchmarkTimeString-4       5              3              -40.00%
BenchmarkTimeGoString-4     4              1              -75.00%

benchmark                   old bytes     new bytes     delta
BenchmarkTimeString-4       152           128           -15.79%
BenchmarkTimeGoString-4     248           80            -67.74%

Change-Id: I64eabe2ab0b3d4a846453c2e8e548a831d720b8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/343971
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Alexander Rakoczy <alex@golang.org>
2021-08-25 18:27:41 +00:00
astraw99 850768bbc9 time: update current time comment
In the time package, the ticker and timer both send
current time to channel C, so this PR update the comment
to understand them better.

Change-Id: I99846a40bf8ef780bf0062dd84cf721b3b892a1b
GitHub-Last-Rev: 535da54b8e
GitHub-Pull-Request: golang/go#47597
Reviewed-on: https://go-review.googlesource.com/c/go/+/340649
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
2021-08-16 17:24:37 +00:00
Ian Lance Taylor 1162aae0ad time/tzdata: update links in comment
Change-Id: I141d29bb4adc957de5de1f8ed8867980fd3c8386
Reviewed-on: https://go-review.googlesource.com/c/go/+/342071
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
2021-08-15 00:19:34 +00:00
Russ Cox 044ec4fa98 time: fix docs for new comma layouts
The current text is slightly inaccurate. Make it more correct.

Change-Id: Iebe0051b74649d13982d7eefe3697f9e69c9b75d
Reviewed-on: https://go-review.googlesource.com/c/go/+/340449
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
2021-08-12 21:29:44 +00:00
Ian Lance Taylor 798ec73519 runtime: don't clear timerModifiedEarliest if adjustTimers is 0
This avoids a race when a new timerModifiedEarlier timer is created by
a different goroutine.

Fixes #47329

Change-Id: I6f6c87b4a9b5491b201c725c10bc98e23e0ed9d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/336432
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
2021-07-22 19:26:40 +00:00
helloPiers 1d91551b73 time: correct typo in documentation for UnixMicro
Fixes #47283.

Change-Id: Ibdc35433d22be3caa70197b6a95c66999812a16a
GitHub-Last-Rev: 75962b0294
GitHub-Pull-Request: golang/go#47284
Reviewed-on: https://go-review.googlesource.com/c/go/+/335549
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Than McIntosh <thanm@google.com>
2021-07-19 21:56:09 +00:00
Andy Pan 86d72fa2cb time: handle invalid UTF-8 byte sequences in quote to prevent panic
Fixes #46883
Updates CL 267017

Change-Id: I15c307bfb0aaa2877a148d32527681f79df1a650
Reviewed-on: https://go-review.googlesource.com/c/go/+/330289
Reviewed-by: Kevin Burke <kev@inburke.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
2021-06-24 03:20:33 +00:00
Russ Cox b0355a3e72 time: fix receiver for Time.IsDST method
Only methods that modify the time take pointer receivers;
IsDST does not modify it and therefore should not.

For #42102 and #46688.

Change-Id: I4721ef7f4d7572236ae6e4d99a459b9ffb11999e
Reviewed-on: https://go-review.googlesource.com/c/go/+/326789
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-06-17 03:25:37 +00:00
Rob Pike 5e191f8f48 time: rewrite the documentation for layout strings
People continue to be confused by how these work. Address that by some
rejiggering.

Introduce a constant called Layout that both defines the time and
provides a reference point for Parse and Format to refer to. We can
then delete much redundancy, especially for Format's comments, but
Parse tightens a bit too.

Then change the way the concept of the layout string is introduced,
and provide a clearer catalog of what its elements are.

Fixes #38871

Change-Id: Ib967ae70c7d5798a97b865cdda1fda4daed8a99a
Reviewed-on: https://go-review.googlesource.com/c/go/+/320252
Trust: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2021-05-18 02:39:04 +00:00
Kevin Burke bb09f8a29b time: make time.Time print a valid Go string with %#v
Previously calling fmt.Sprintf("%#v", t) on a time.Time value would
yield a result like:

    time.Time{wall:0x0, ext:63724924180, loc:(*time.Location)(nil)}

which does not compile when embedded in a Go program, and does not
tell you what value is represented at a glance.

This change adds a GoString method that returns much more legible
output:

    "time.Date(2009, time.February, 5, 5, 0, 57, 12345600, time.UTC)"

which gives you more information about the time.Time and also can be
usefully embedded in a Go program without additional work.

Update Quote() to hex escape non-ASCII characters (copying logic
from strconv), which makes it safer to embed them in the output of
GoString().

Fixes #39034.

Change-Id: Ic985bafe4e556f64e82223c643f65143c9a45c3b
Reviewed-on: https://go-review.googlesource.com/c/go/+/267017
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
2021-05-02 20:59:26 +00:00
Ian Lance Taylor 13e87cda00 time: increase slop for TestTicker
Also sleep a bit each time it fails, in case the system is overloaded.

Fixes #37332

Change-Id: Iabf3d0a27b5834c1e2a87c826b6206146b4f62c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/313849
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-04-27 19:37:31 +00:00
Damien Neil 566a87c16b time: add missing "os" import to zoneinfo_test.go
Updates #45448

Change-Id: I2e79ae6b9cf43a481aa703578712619ea344e421
Reviewed-on: https://go-review.googlesource.com/c/go/+/310212
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-04-15 00:40:43 +00:00
Manlio Perillo f18715c18f time: replace os.Setenv with T.Setenv
Updates #45448

Change-Id: Ic096fe1c58c124fb8d84ee15c9446e7ed060b24f
Reviewed-on: https://go-review.googlesource.com/c/go/+/310032
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
2021-04-14 23:26:02 +00:00
Martin Sucha d1f8104b58 time: move slim test tzdata to testdata directory
The lines with tzdata are quite long.

It is easier to just copy a file than to encode it as
a string literal when adding a new test case.

Change-Id: Ibcaf347c3101a0f05b094e582b3473c7c35b685a
Reviewed-on: https://go-review.googlesource.com/c/go/+/308998
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
2021-04-14 19:38:36 +00:00
Ahmet Aktürk 1271e9a9cc time: properly quote strings containing quotes and backslashes
Fixes #45391

Change-Id: I43ea597f6a9596a621ae7b63eb05440d5b9e2d8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/307192
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-04-06 19:18:47 +00:00
Martin Sucha a11244e95e time: use offset and isDST when caching zone from extend string
If the current time is computed from extend string
and the zone file contains multiple zones with the
same name, the lookup by name might find incorrect
zone.

This happens for example with the slim Europe/Dublin
time zone file in the embedded zip. This zone file
has last transition in 1996 and rest is covered by
extend string.
tzset returns IST as the zone name to use, but there
are two records with IST name. Lookup by name finds
the wrong one. We need to check offset and isDST too.

In case we can't find an existing zone, we allocate
a new zone so that we use correct offset and isDST.

I have renamed zone variable to zones as it shadowed
the zone type that we need to allocate the cached zone.

Fixes #45370

Change-Id: I79102e4873b6de20d8a65f8a3057519ff5fae608
Reviewed-on: https://go-review.googlesource.com/c/go/+/307190
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-04-05 18:52:42 +00:00
Conrad Irwin 49dccf141f time: add Time.Unix{Milli,Micro} and to-Time helpers UnixMicro, UnixMilli
Adds helper functions for users working with other systems which
represent time in milliseconds or microseconds since the Unix epoch.

Fixes #44196

Change-Id: Ibc4490b52ddec94ebd0c692cb7b52a33e4536759
Reviewed-on: https://go-review.googlesource.com/c/go/+/293349
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-03-27 05:38:26 +00:00
Andy Pan a5df88355c time: check int64 overflow in Time.addSec
Change-Id: Ibbed54239228e7ea31ef5978d427425899c3b943
Reviewed-on: https://go-review.googlesource.com/c/go/+/300890
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Baokun Lee <bk@golangcn.org>
2021-03-17 19:48:52 +00:00
Emmanuel T Odeke f02a26bed0 time: support "," as separator for fractional seconds
Accepts comma "," as a separator for fractional seconds
hence we now accept:
* 2006-01-02 15:04:05,999999999 -0700 MST
* Mon Jan _2 15:04:05,120007 2006
* Mon Jan 2 15:04:05,120007 2006

This change follows the recommendations of ISO 8601 per

   https://en.wikipedia.org/wiki/ISO_8601#cite_note-26

which states

   ISO 8601:2004(E), ISO, 2004-12-01, "4.2.2.4 ...
   the decimal fraction shall be divided from the integer
   part by the decimal sign specified in ISO 31-0, i.e.
   the comma [,] or full stop [.]. Of these, the comma
   is the preferred sign."

Unfortunately, I couldn't directly access the ISO 8601 document
because suddenly it is behind a paywall on the ISO website,
charging CHF 158 (USD 179) for 38 pages :-(

However, this follows publicly available cited literature, as well
as the recommendations from the proposal approval.

Fixes #6189
Updates #27746
Updates #26002
Updates #36145
Updates #43813
Fixes #43823

Change-Id: Ibe96064e8ee27c239be78c880fa561a1a41e190c
Reviewed-on: https://go-review.googlesource.com/c/go/+/300996
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
2021-03-16 00:27:31 +00:00
Joel Courtney a9b3c4bd06 time: add Time.IsDST() to check if its Location is in Daylight Savings Time
Fixes #42102

Change-Id: I2cd2fdf67c794c3e99ed1c24786f7f779da73962
GitHub-Last-Rev: bbfa921357
GitHub-Pull-Request: golang/go#42103
Reviewed-on: https://go-review.googlesource.com/c/go/+/264077
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Rob Pike <r@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
2021-03-15 23:56:07 +00:00
Michael Pratt aa26687e45 runtime, time: disable preemption in addtimer
The timerpMask optimization updates a mask of Ps (potentially)
containing timers in pidleget / pidleput. For correctness, it depends on
the assumption that new timers can only be added to a P's own heap.

addtimer violates this assumption if it is preempted after computing pp.
That G may then run on a different P, but adding a timer to the original
P's heap.

Avoid this by disabling preemption while pp is in use.

Other uses of doaddtimer should be OK:

* moveTimers: always moves to the current P's heap
* modtimer, cleantimers, addAdjustedTimers, runtimer: does not add net
  new timers to the heap while locked

Fixes #44868

Change-Id: I4a5d080865e854931d0a3a09a51ca36879101d72
Reviewed-on: https://go-review.googlesource.com/c/go/+/300610
Trust: Michael Pratt <mpratt@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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2021-03-10 21:49:24 +00:00
Ian Lance Taylor d9fd38e68b time: correct unusual extension string cases
This fixes two uncommon cases.

First, the tzdata code permits timezone offsets up to 24 * 7, although
the POSIX TZ parsing does not. The tzdata code uses this to specify a
day of week in some cases.

Second, we incorrectly rejected a negative time offset for when a time
zone change comes into effect.

Fixes #44385

Change-Id: I5f2efc1d385e9bfa974a0de3fa81e7a94b827602
Reviewed-on: https://go-review.googlesource.com/c/go/+/296392
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
2021-02-27 03:03:29 +00:00
Russ Cox d4b2638234 all: go fmt std cmd (but revert vendor)
Make all our package sources use Go 1.17 gofmt format
(adding //go:build lines).

Part of //go:build change (#41184).
See https://golang.org/design/draft-gobuild

Change-Id: Ia0534360e4957e58cd9a18429c39d0e32a6addb4
Reviewed-on: https://go-review.googlesource.com/c/go/+/294430
Trust: Russ Cox <rsc@golang.org>
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Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-02-20 03:54:50 +00:00
Tobias Klauser 54b251f542 lib/time, time/tzdata: update tzdata to 2021a
Changelog:

  South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.

Release announcement:

  http://mm.icann.org/pipermail/tz-announce/2021-January/000065.html

Updates #22487

Change-Id: Ia0a1a7a8f5d47adac9782bc2a445f69e02440f77
Reviewed-on: https://go-review.googlesource.com/c/go/+/285719
Trust: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
2021-01-25 16:08:46 +00:00
Brad Fitzpatrick 50cba0506f time: clarify Timer.Reset behavior on AfterFunc Timers
Fixes #28100

Change-Id: I37d4d7badf455e4ecf982d4fc7cb070052de2e45
Reviewed-on: https://go-review.googlesource.com/c/go/+/285632
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-01-22 14:50:17 +00:00
Alberto Donizetti 20d0991b86 lib/time, time/tzdata: update tzdata to 2020f
Changelog

 'make rearguard_tarballs' no longer generates a bad rearguard.zi,
 fixing a 2020e bug.

No actual changes to timezones data. See

  http://mm.icann.org/pipermail/tz-announce/2020-December/000064.html

Updates #22487

Change-Id: I78f7adba1c3c1d3489b0da870601117b9b8cb0d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/280455
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
2020-12-30 22:51:30 +00:00
Alberto Donizetti d1502b3c72 lib/time, time/tzdata: update tzdata to 2020e
Changelog:

  Volgograd switches to Moscow time on 2020-12-27 at 02:00.
  Small changes to past timestamps and abbreviations.

See

  http://mm.icann.org/pipermail/tz-announce/2020-December/000063.html

Updates #22487

Change-Id: I709abe899ca498698463e945ccbcf4bc5fe60b92
Reviewed-on: https://go-review.googlesource.com/c/go/+/279794
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
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Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-12-23 17:29:16 +00:00
Russ Cox 4f1b0a44cb all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp
As part of #42026, these helpers from io/ioutil were moved to os.
(ioutil.TempFile and TempDir became os.CreateTemp and MkdirTemp.)

Update the Go tree to use the preferred names.

As usual, code compiled with the Go 1.4 bootstrap toolchain
and code vendored from other sources is excluded.

ReadDir changes are in a separate CL, because they are not a
simple search and replace.

For #42026.

Change-Id: If318df0216d57e95ea0c4093b89f65e5b0ababb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/266365
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-12-09 19:12:23 +00:00
Michael Pratt b78b427be5 runtime, time: strictly enforce when, period constraints
timer.when must always be positive. addtimer and modtimer already check
that it is non-negative; we expand it to include zero. Also upgrade from
pinning bad values to throwing, as these values shouldn't be possible to
pass (except as below).

timeSleep may overflow timer.nextwhen. This would previously have been
pinned by resetForSleep, now we fix it manually.

runOneTimer may overflow timer.when when adding timer.period. Detect
this and pin to maxWhen.

addtimer is now too strict to allow TestOverflowRuntimeTimer to test an
overflowed timer. Such a timer should not be possible; to help guard
against accidental inclusion siftup / siftdown will check timers as it
goes. This has been replaced with tests for period and sleep overflows.

Change-Id: I17f9739e27ebcb20d87945c635050316fb8e9226
Reviewed-on: https://go-review.googlesource.com/c/go/+/274853
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-12-03 21:23:16 +00:00
Michael Pratt b635e4b808 time, runtime: don't set timer when = 0
timer when == 0, in the context of timer0When and timerModifiedEarliest,
is a sentinel value meaning there are no timers on the heap.
TestCheckRuntimeTimerOverflow reaching into the runtime to set a timer
to when = 0 when it is otherwise not possible breaks this invariant.

After golang.org/cl/258303, we will no longer detect and run this timer,
thus blocking any other timers lower on the heap from running. This
manifests as random timers failing to fire in other tests.

The need to set this overflowed timer to when = 0 is gone with the old
timer proc implementation, so we can simply remove it.

Fixes #42424

Change-Id: Iea32100136ad8ec1bedfa77b1e7d9ed868812838
Reviewed-on: https://go-review.googlesource.com/c/go/+/274632
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
2020-12-03 21:21:23 +00:00
Alberto Donizetti bcfaeca58c time: in NewTicker, document that the 1st tick comes after d
Fixes #42245

Change-Id: I3b298ab6be65569389873d68bd3c6e49cf892c69
Reviewed-on: https://go-review.googlesource.com/c/go/+/265818
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
2020-11-18 04:43:50 +00:00
Christopher Hlubek 70e022e4a8 time: fix LoadLocationFromTZData with slim tzdata
The extend information of a time zone file with last transition < now
could result in a wrong cached zone because it used the zone of the
last transition.

This could lead to wrong zones in systems with slim zoneinfo.

Fixes #42216

Change-Id: I7c57c35b5cfa58482ac7925b5d86618c52f5444d
Reviewed-on: https://go-review.googlesource.com/c/go/+/264939
Trust: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-10-27 23:36:05 +00:00
Chris Hines 8fdc79e18a runtime: reduce timer latency
Change the scheduler to treat expired timers with the same approach it
uses to steal runnable G's.

Previously the scheduler ignored timers on P's not marked for
preemption. That had the downside that any G's waiting on those expired
timers starved until the G running on their P completed or was
preempted. That could take as long as 20ms if sysmon was in a 10ms
wake up cycle.

In addition, a spinning P that ignored an expired timer and found no
other work would stop despite there being available work, missing the
opportunity for greater parallelism.

With this change the scheduler no longer ignores timers on
non-preemptable P's or relies on sysmon as a backstop to start threads
when timers expire. Instead it wakes an idle P, if needed, when
creating a new timer because it cannot predict if the current P will
have a scheduling opportunity before the new timer expires. The P it
wakes will determine how long to sleep and block on the netpoller for
the required time, potentially stealing the new timer when it wakes.

This change also eliminates a race between a spinning P transitioning
to idle concurrently with timer creation using the same pattern used
for submission of new goroutines in the same window.

Benchmark analysis:

CL 232199, which was included in Go 1.15 improved timer latency over Go
1.14 by allowing P's to steal timers from P's not marked for preemption.
The benchmarks added in this CL measure that improvement in the
ParallelTimerLatency benchmark seen below. However, Go 1.15 still relies
on sysmon to notice expired timers in some situations and sysmon can
sleep for up to 10ms before waking to check timers. This CL fixes that
shortcoming with modest regression on other benchmarks.

name \ avg-late-ns                                        go14.time.bench  go15.time.bench  fix.time.bench
ParallelTimerLatency-8                                         17.3M ± 3%        7.9M ± 0%       0.2M ± 3%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-8        53.4k ±23%       50.7k ±31%     252.4k ± 9%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-8         204k ±14%         90k ±58%       188k ±12%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-8        1.17M ± 0%       0.11M ± 5%      0.11M ± 2%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-8        1.81M ±44%       0.10M ± 4%      0.10M ± 2%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-8        2.28M ±66%       0.09M ±13%      0.08M ±21%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-8        2.84M ±85%       0.07M ±15%      0.07M ±18%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-8        2.13M ±27%       0.06M ± 4%      0.06M ± 9%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-8        2.63M ± 6%       0.06M ±11%      0.06M ± 9%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-8        3.32M ±17%       0.06M ±16%      0.07M ±14%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-8       8.46M ±20%       4.37M ±21%      5.03M ±23%
StaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-8          1.02M ± 1%       0.20M ± 2%      0.20M ± 2%

name \ max-late-ns                                        go14.time.bench  go15.time.bench  fix.time.bench
ParallelTimerLatency-8                                         18.3M ± 1%        8.2M ± 0%       0.5M ±12%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-8         141k ±19%        127k ±19%      1129k ± 3%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-8        2.78M ± 4%       1.23M ±15%      1.26M ± 5%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-8        6.05M ± 5%       0.67M ±56%      0.81M ±33%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-8        7.93M ±20%       0.71M ±46%      0.76M ±41%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-8        9.41M ±30%       0.92M ±23%      0.81M ±44%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-8        10.8M ±42%        0.8M ±41%       0.8M ±30%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-8        9.62M ±24%       0.77M ±38%      0.88M ±27%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-8        10.6M ±10%        0.8M ±32%       0.7M ±27%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-8        11.9M ±36%        0.6M ±46%       0.8M ±38%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-8       36.8M ±21%       24.7M ±21%      27.5M ±16%
StaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-8          2.12M ± 2%       1.02M ±11%      1.03M ± 7%

Other time benchmarks:
name \ time/op          go14.time.bench  go15.time.bench  fix.time.bench
AfterFunc-8                  137µs ± 4%       123µs ± 4%      131µs ± 2%
After-8                      212µs ± 3%       195µs ± 4%      204µs ± 7%
Stop-8                       165µs ± 6%       156µs ± 2%      151µs ±12%
SimultaneousAfterFunc-8      260µs ± 3%       248µs ± 3%      284µs ± 2%
StartStop-8                 65.8µs ± 9%      64.4µs ± 7%     67.3µs ±15%
Reset-8                     13.6µs ± 2%       9.6µs ± 2%      9.1µs ± 4%
Sleep-8                      307µs ± 4%       306µs ± 3%      320µs ± 2%
Ticker-8                    53.0µs ± 5%      54.5µs ± 5%     57.0µs ±11%
TickerReset-8                                9.24µs ± 2%     9.51µs ± 3%
TickerResetNaive-8                            149µs ± 5%      145µs ± 5%

Fixes #38860
Updates #25471
Updates #27707

Change-Id: If52680509b0f3b66dbd1d0c13fa574bd2d0bbd57
Reviewed-on: https://go-review.googlesource.com/c/go/+/232298
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Ian Lance Taylor <iant@golang.org>
2020-10-27 17:24:42 +00:00
Tobias Klauser fe5f95eecc lib/time, time/tzdata: update tz data to 2020d
See http://mm.icann.org/pipermail/tz-announce/2020-October/000060.html
and http://mm.icann.org/pipermail/tz-announce/2020-October/000062.html
for a description of the changes.

Updates #22487

Change-Id: I4b2717d2d642284889345a0125eb6c614575c0ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/264681
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2020-10-24 21:42:44 +00:00
subham sarkar a972e8ccb9 all: fix quoting for compress/bzip2 and time's godoc
The existing usage of grave accent (`) and apostrophe (')
at some places made godoc to ignore them and show it as it is.
So, use both of the characters twice (consecutively) so that
godoc can convert it to {left,right} double quotation mark.

Fixes #41958

Change-Id: I64fd9b5fa34f416ad595009d09f5482e10bd8b4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/262397
Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
2020-10-23 21:57:39 +00:00