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