97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
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// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/time/time.h"
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#include <memory>
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#include "base/logging.h"
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#include "base/memory/ptr_util.h"
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#include "third_party/icu/source/i18n/unicode/calendar.h"
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#include "third_party/icu/source/i18n/unicode/timezone.h"
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namespace base {
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static_assert(
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sizeof(Time::Exploded::year) == sizeof(int32_t),
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"The sizes of Time::Exploded members and ICU date fields do not match.");
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namespace {
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// Returns a new icu::Calendar instance for the local time zone if |is_local|
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// and for GMT otherwise. Returns null on error.
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std::unique_ptr<icu::Calendar> CreateCalendar(bool is_local) {
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UErrorCode status = U_ZERO_ERROR;
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std::unique_ptr<icu::Calendar> calendar =
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base::WrapUnique(is_local ? icu::Calendar::createInstance(status)
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: icu::Calendar::createInstance(
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*icu::TimeZone::getGMT(), status));
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CHECK(U_SUCCESS(status));
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return calendar;
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}
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} // namespace
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void Time::Explode(bool is_local, Exploded* exploded) const {
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std::unique_ptr<icu::Calendar> calendar = CreateCalendar(is_local);
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UErrorCode status = U_ZERO_ERROR;
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calendar->setTime(ToRoundedDownMillisecondsSinceUnixEpoch(), status);
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DCHECK(U_SUCCESS(status));
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exploded->year = calendar->get(UCAL_YEAR, status);
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DCHECK(U_SUCCESS(status));
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// ICU's UCalendarMonths is 0-based. E.g., 0 for January.
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exploded->month = calendar->get(UCAL_MONTH, status) + 1;
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DCHECK(U_SUCCESS(status));
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// ICU's UCalendarDaysOfWeek is 1-based. E.g., 1 for Sunday.
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exploded->day_of_week = calendar->get(UCAL_DAY_OF_WEEK, status) - 1;
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DCHECK(U_SUCCESS(status));
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exploded->day_of_month = calendar->get(UCAL_DAY_OF_MONTH, status);
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DCHECK(U_SUCCESS(status));
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exploded->hour = calendar->get(UCAL_HOUR_OF_DAY, status);
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DCHECK(U_SUCCESS(status));
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exploded->minute = calendar->get(UCAL_MINUTE, status);
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DCHECK(U_SUCCESS(status));
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exploded->second = calendar->get(UCAL_SECOND, status);
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DCHECK(U_SUCCESS(status));
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exploded->millisecond = calendar->get(UCAL_MILLISECOND, status);
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DCHECK(U_SUCCESS(status));
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}
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// static
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bool Time::FromExploded(bool is_local, const Exploded& exploded, Time* time) {
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// ICU's UCalendarMonths is 0-based. E.g., 0 for January.
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CheckedNumeric<int> month = exploded.month;
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month--;
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if (!month.IsValid()) {
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*time = Time(0);
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return false;
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}
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std::unique_ptr<icu::Calendar> calendar = CreateCalendar(is_local);
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// Cause getTime() to report an error if invalid dates, such as the 31st day
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// of February, are specified.
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calendar->setLenient(false);
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calendar->set(exploded.year, month.ValueOrDie(), exploded.day_of_month,
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exploded.hour, exploded.minute, exploded.second);
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calendar->set(UCAL_MILLISECOND, exploded.millisecond);
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// Ignore exploded.day_of_week
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UErrorCode status = U_ZERO_ERROR;
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UDate date = calendar->getTime(status);
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if (U_FAILURE(status)) {
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*time = Time(0);
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return false;
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}
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return FromMillisecondsSinceUnixEpoch(date, time);
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}
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} // namespace base
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