- 04 Apr, 2018 1 commit
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Jungshik Shin authored
This is a reland of dbdede01 after a webkit layout test (geolocation-api/timestamp.html) was fixed by https://chromium-review.googlesource.com/c/chromium/src/+/994343 . Original change's description: > Implement a new spec for timezone offset calculation > > https://github.com/tc39/ecma262/pull/778 was recently merged > to Ecma 262. > > It changes the way to convert between "local time" and UTC in such > a way that it'd work for all timezones whether or not there has > been any change in the timezone offset of the standard time. For > instance, Europe/Moscow and some parts of US state of Indiana have > changed the standard (non-DST) timezone offset a few times. The > previous spec assumes that the the standard timezone offset is > constant, but the new spec take into account the offset change > history. > > In addition, it specifies a new way to calculate the timezone > offset during a timezone transition (either in and > out of DST or timezone offset shift). > > During a negative transition (e.g. fall backward / getting > out of DST), repeated times are to be interpreted as if the > offset before the transition is in effect. > > During a positive transition (e.g. spring forward / getting > into DST), skipped times are to be treated similarly. That > is, they are to be interpreted as if the offset before the > transition is in effect. > > With icu-timezone-data, v8 is compliant to the new spec for the > past and the future as well as now whether or not the standard > timezone offset of a given timezone has changed over time > (e.g. Europe/Moscow, Pacific/Apia). With icu-timezone-data, > Australia/Lord_Howe (30 minute DST change) also works per spec. > > Without icu-timezone-data, it works only for timezones of which > the standard timezone offset is the same as the current offset > (e.g. most North American timezones other than parts of Indiana) > and of which the DST shift is an hour. For instance, it doesn't work > for Europe/Moscow in 2010 when the standard timezone offset was > +4h because the current (2018) standard timezone offset is +3h. Neither > does it for Lord Howe in Australia with the DST shift of 0.5 hr. > > This CL used to require one of the two ICU CLs below, but not > any more. > > https://chromium-review.googlesource.com/c/chromium/deps/icu/+/572652 > https://chromium-review.googlesource.com/851265 (a proposed CL to the > upstream ICU). > > Bug: v8:3547,chromium:417640,v8:5714 > Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng > Change-Id: Ib162295da5bee31b2390bd0918157014aebd3e33 > Reviewed-on: https://chromium-review.googlesource.com/572148 > Commit-Queue: Jungshik Shin <jshin@chromium.org> > Reviewed-by: Daniel Ehrenberg <littledan@chromium.org> > Reviewed-by: Michael Lippautz <mlippautz@chromium.org> > Cr-Commit-Position: refs/heads/master@{#52332} Bug: v8:3547, chromium:417640, v8:5714 Change-Id: I47536c111143f75e3cfeecf5d9761c43a98a10f5 Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng;master.tryserver.blink:linux_trusty_blink_rel Reviewed-on: https://chromium-review.googlesource.com/995971 Commit-Queue: Jungshik Shin <jshin@chromium.org> Reviewed-by: Clemens Hammacher <clemensh@chromium.org> Cr-Commit-Position: refs/heads/master@{#52372}
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- 03 Apr, 2018 2 commits
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Clemens Hammacher authored
This reverts commit dbdede01. Reason for revert: Fails webkit_tests, blocks roll: https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064 Original change's description: > Implement a new spec for timezone offset calculation > > https://github.com/tc39/ecma262/pull/778 was recently merged > to Ecma 262. > > It changes the way to convert between "local time" and UTC in such > a way that it'd work for all timezones whether or not there has > been any change in the timezone offset of the standard time. For > instance, Europe/Moscow and some parts of US state of Indiana have > changed the standard (non-DST) timezone offset a few times. The > previous spec assumes that the the standard timezone offset is > constant, but the new spec take into account the offset change > history. > > In addition, it specifies a new way to calculate the timezone > offset during a timezone transition (either in and > out of DST or timezone offset shift). > > During a negative transition (e.g. fall backward / getting > out of DST), repeated times are to be interpreted as if the > offset before the transition is in effect. > > During a positive transition (e.g. spring forward / getting > into DST), skipped times are to be treated similarly. That > is, they are to be interpreted as if the offset before the > transition is in effect. > > With icu-timezone-data, v8 is compliant to the new spec for the > past and the future as well as now whether or not the standard > timezone offset of a given timezone has changed over time > (e.g. Europe/Moscow, Pacific/Apia). With icu-timezone-data, > Australia/Lord_Howe (30 minute DST change) also works per spec. > > Without icu-timezone-data, it works only for timezones of which > the standard timezone offset is the same as the current offset > (e.g. most North American timezones other than parts of Indiana) > and of which the DST shift is an hour. For instance, it doesn't work > for Europe/Moscow in 2010 when the standard timezone offset was > +4h because the current (2018) standard timezone offset is +3h. Neither > does it for Lord Howe in Australia with the DST shift of 0.5 hr. > > This CL used to require one of the two ICU CLs below, but not > any more. > > https://chromium-review.googlesource.com/c/chromium/deps/icu/+/572652 > https://chromium-review.googlesource.com/851265 (a proposed CL to the > upstream ICU). > > Bug: v8:3547,chromium:417640,v8:5714 > Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng > Change-Id: Ib162295da5bee31b2390bd0918157014aebd3e33 > Reviewed-on: https://chromium-review.googlesource.com/572148 > Commit-Queue: Jungshik Shin <jshin@chromium.org> > Reviewed-by: Daniel Ehrenberg <littledan@chromium.org> > Reviewed-by: Michael Lippautz <mlippautz@chromium.org> > Cr-Commit-Position: refs/heads/master@{#52332} TBR=adamk@chromium.org,littledan@chromium.org,mlippautz@chromium.org,jshin@chromium.org Change-Id: I6b3bf4427c761b106280d565a3912cd8e25cf87e No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: v8:3547, chromium:417640, v8:5714 Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng Reviewed-on: https://chromium-review.googlesource.com/994192Reviewed-by: Clemens Hammacher <clemensh@chromium.org> Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Cr-Commit-Position: refs/heads/master@{#52338}
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Jungshik Shin authored
https://github.com/tc39/ecma262/pull/778 was recently merged to Ecma 262. It changes the way to convert between "local time" and UTC in such a way that it'd work for all timezones whether or not there has been any change in the timezone offset of the standard time. For instance, Europe/Moscow and some parts of US state of Indiana have changed the standard (non-DST) timezone offset a few times. The previous spec assumes that the the standard timezone offset is constant, but the new spec take into account the offset change history. In addition, it specifies a new way to calculate the timezone offset during a timezone transition (either in and out of DST or timezone offset shift). During a negative transition (e.g. fall backward / getting out of DST), repeated times are to be interpreted as if the offset before the transition is in effect. During a positive transition (e.g. spring forward / getting into DST), skipped times are to be treated similarly. That is, they are to be interpreted as if the offset before the transition is in effect. With icu-timezone-data, v8 is compliant to the new spec for the past and the future as well as now whether or not the standard timezone offset of a given timezone has changed over time (e.g. Europe/Moscow, Pacific/Apia). With icu-timezone-data, Australia/Lord_Howe (30 minute DST change) also works per spec. Without icu-timezone-data, it works only for timezones of which the standard timezone offset is the same as the current offset (e.g. most North American timezones other than parts of Indiana) and of which the DST shift is an hour. For instance, it doesn't work for Europe/Moscow in 2010 when the standard timezone offset was +4h because the current (2018) standard timezone offset is +3h. Neither does it for Lord Howe in Australia with the DST shift of 0.5 hr. This CL used to require one of the two ICU CLs below, but not any more. https://chromium-review.googlesource.com/c/chromium/deps/icu/+/572652 https://chromium-review.googlesource.com/851265 (a proposed CL to the upstream ICU). Bug: v8:3547,chromium:417640,v8:5714 Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng Change-Id: Ib162295da5bee31b2390bd0918157014aebd3e33 Reviewed-on: https://chromium-review.googlesource.com/572148 Commit-Queue: Jungshik Shin <jshin@chromium.org> Reviewed-by: Daniel Ehrenberg <littledan@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#52332}
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