1 // Copyright 2019 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/time/time.h"
6
7 #include <memory>
8
9 #include "base/logging.h"
10 #include "base/memory/ptr_util.h"
11 #include "third_party/icu/source/i18n/unicode/calendar.h"
12 #include "third_party/icu/source/i18n/unicode/timezone.h"
13
14 namespace base {
15
16 static_assert(
17 sizeof(Time::Exploded::year) == sizeof(int32_t),
18 "The sizes of Time::Exploded members and ICU date fields do not match.");
19
20 namespace {
21
22 // Returns a new icu::Calendar instance for the local time zone if |is_local|
23 // and for GMT otherwise. Returns null on error.
CreateCalendar(bool is_local)24 std::unique_ptr<icu::Calendar> CreateCalendar(bool is_local) {
25 UErrorCode status = U_ZERO_ERROR;
26 std::unique_ptr<icu::Calendar> calendar =
27 base::WrapUnique(is_local ? icu::Calendar::createInstance(status)
28 : icu::Calendar::createInstance(
29 *icu::TimeZone::getGMT(), status));
30 CHECK(U_SUCCESS(status));
31
32 return calendar;
33 }
34
35 } // namespace
36
Explode(bool is_local,Exploded * exploded) const37 void Time::Explode(bool is_local, Exploded* exploded) const {
38 std::unique_ptr<icu::Calendar> calendar = CreateCalendar(is_local);
39
40 UErrorCode status = U_ZERO_ERROR;
41 calendar->setTime(ToRoundedDownMillisecondsSinceUnixEpoch(), status);
42 DCHECK(U_SUCCESS(status));
43
44 exploded->year = calendar->get(UCAL_YEAR, status);
45 DCHECK(U_SUCCESS(status));
46
47 // ICU's UCalendarMonths is 0-based. E.g., 0 for January.
48 exploded->month = calendar->get(UCAL_MONTH, status) + 1;
49 DCHECK(U_SUCCESS(status));
50 // ICU's UCalendarDaysOfWeek is 1-based. E.g., 1 for Sunday.
51 exploded->day_of_week = calendar->get(UCAL_DAY_OF_WEEK, status) - 1;
52 DCHECK(U_SUCCESS(status));
53 exploded->day_of_month = calendar->get(UCAL_DAY_OF_MONTH, status);
54 DCHECK(U_SUCCESS(status));
55 exploded->hour = calendar->get(UCAL_HOUR_OF_DAY, status);
56 DCHECK(U_SUCCESS(status));
57 exploded->minute = calendar->get(UCAL_MINUTE, status);
58 DCHECK(U_SUCCESS(status));
59 exploded->second = calendar->get(UCAL_SECOND, status);
60 DCHECK(U_SUCCESS(status));
61 exploded->millisecond = calendar->get(UCAL_MILLISECOND, status);
62 DCHECK(U_SUCCESS(status));
63 }
64
65 // static
FromExploded(bool is_local,const Exploded & exploded,Time * time)66 bool Time::FromExploded(bool is_local, const Exploded& exploded, Time* time) {
67 // ICU's UCalendarMonths is 0-based. E.g., 0 for January.
68 CheckedNumeric<int> month = exploded.month;
69 month--;
70 if (!month.IsValid()) {
71 *time = Time(0);
72 return false;
73 }
74
75 std::unique_ptr<icu::Calendar> calendar = CreateCalendar(is_local);
76
77 // Cause getTime() to report an error if invalid dates, such as the 31st day
78 // of February, are specified.
79 calendar->setLenient(false);
80
81 calendar->set(exploded.year, month.ValueOrDie(), exploded.day_of_month,
82 exploded.hour, exploded.minute, exploded.second);
83 calendar->set(UCAL_MILLISECOND, exploded.millisecond);
84 // Ignore exploded.day_of_week
85
86 UErrorCode status = U_ZERO_ERROR;
87 UDate date = calendar->getTime(status);
88 if (U_FAILURE(status)) {
89 *time = Time(0);
90 return false;
91 }
92
93 return FromMillisecondsSinceUnixEpoch(date, time);
94 }
95
96 } // namespace base
97