1// Copyright 2018 The Abseil Authors.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// https://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#include "absl/time/civil_time.h"
16
17#include <cstdlib>
18#include <string>
19
20#include "absl/strings/str_cat.h"
21#include "absl/time/time.h"
22
23namespace absl {
24
25namespace {
26
27// Since a civil time has a larger year range than absl::Time (64-bit years vs
28// 64-bit seconds, respectively) we normalize years to roughly +/- 400 years
29// around the year 2400, which will produce an equivalent year in a range that
30// absl::Time can handle.
31inline civil_year_t NormalizeYear(civil_year_t year) {
32 return 2400 + year % 400;
33}
34
35// Formats the given CivilSecond according to the given format.
36std::string FormatYearAnd(string_view fmt, CivilSecond cs) {
37 const CivilSecond ncs(NormalizeYear(cs.year()), cs.month(), cs.day(),
38 cs.hour(), cs.minute(), cs.second());
39 const TimeZone utc = UTCTimeZone();
40 // TODO(absl-team): Avoid conversion of fmt std::string.
41 return StrCat(cs.year(),
42 FormatTime(std::string(fmt), FromCivil(ncs, utc), utc));
43}
44
45} // namespace
46
47std::string FormatCivilTime(CivilSecond c) {
48 return FormatYearAnd("-%m-%dT%H:%M:%S", c);
49}
50std::string FormatCivilTime(CivilMinute c) {
51 return FormatYearAnd("-%m-%dT%H:%M", c);
52}
53std::string FormatCivilTime(CivilHour c) {
54 return FormatYearAnd("-%m-%dT%H", c);
55}
56std::string FormatCivilTime(CivilDay c) { return FormatYearAnd("-%m-%d", c); }
57std::string FormatCivilTime(CivilMonth c) { return FormatYearAnd("-%m", c); }
58std::string FormatCivilTime(CivilYear c) { return FormatYearAnd("", c); }
59
60namespace time_internal {
61
62std::ostream& operator<<(std::ostream& os, CivilYear y) {
63 return os << FormatCivilTime(y);
64}
65std::ostream& operator<<(std::ostream& os, CivilMonth m) {
66 return os << FormatCivilTime(m);
67}
68std::ostream& operator<<(std::ostream& os, CivilDay d) {
69 return os << FormatCivilTime(d);
70}
71std::ostream& operator<<(std::ostream& os, CivilHour h) {
72 return os << FormatCivilTime(h);
73}
74std::ostream& operator<<(std::ostream& os, CivilMinute m) {
75 return os << FormatCivilTime(m);
76}
77std::ostream& operator<<(std::ostream& os, CivilSecond s) {
78 return os << FormatCivilTime(s);
79}
80
81} // namespace time_internal
82
83} // namespace absl
84