1 // OpenTween - Client of Twitter
2 // Copyright (c) 2018 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
3 // All rights reserved.
5 // This file is part of OpenTween.
7 // This program is free software; you can redistribute it and/or modify it
8 // under the terms of the GNU General Public License as published by the Free
9 // Software Foundation; either version 3 of the License, or (at your option)
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 // You should have received a copy of the GNU General Public License along
18 // with this program. If not, see <http://www.gnu.org/licenses/>, or write to
19 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 // Boston, MA 02110-1301, USA.
23 using System.Globalization;
28 /// <see cref="DateTimeKind.Utc"/> に固定された <see cref="DateTime"/> を扱うための構造体
30 public readonly struct DateTimeUtc : IComparable<DateTimeUtc>, IEquatable<DateTimeUtc>
32 public static DateTimeUtc MinValue { get; }
33 = new DateTimeUtc(DateTime.SpecifyKind(DateTime.MinValue, DateTimeKind.Utc));
35 public static DateTimeUtc MaxValue { get; }
36 = new DateTimeUtc(DateTime.SpecifyKind(DateTime.MaxValue, DateTimeKind.Utc));
38 public static DateTimeUtc UnixEpoch { get; }
39 = new DateTimeUtc(1970, 1, 1, 0, 0, 0);
41 public static DateTimeUtc Now
42 => new DateTimeUtc(DateTime.UtcNow);
44 private readonly DateTime datetime;
46 public DateTimeUtc(int year, int month, int day)
47 : this(year, month, day, hour: 0, minute: 0, second: 0)
51 public DateTimeUtc(int year, int month, int day, int hour, int minute, int second)
52 : this(year, month, day, hour, minute, second, millisecond: 0)
56 public DateTimeUtc(int year, int month, int day, int hour, int minute, int second, int millisecond)
57 : this(new DateTime(year, month, day, hour, minute, second, millisecond, DateTimeKind.Utc))
61 public DateTimeUtc(DateTimeOffset datetimeOffset)
62 : this(datetimeOffset.UtcDateTime)
66 public DateTimeUtc(long utcTicks)
67 : this(new DateTime(utcTicks, DateTimeKind.Utc))
71 public DateTimeUtc(DateTime datetime)
73 if (datetime.Kind != DateTimeKind.Utc)
74 throw new ArgumentException("datetime には UTC に変換された時刻が必須です", nameof(datetime));
76 this.datetime = datetime;
80 => this.datetime.Ticks;
82 public long ToUnixTime()
83 => (long)((this - UnixEpoch).TotalSeconds);
85 public DateTimeOffset ToDateTimeOffset()
86 => new DateTimeOffset(this.datetime);
88 public DateTimeOffset ToLocalTime()
89 => this.ToDateTimeOffset().ToLocalTime();
91 public DateTime ToDateTimeUnsafe()
94 public int CompareTo(DateTimeUtc other)
95 => this.datetime.CompareTo(other.datetime);
97 public bool Equals(DateTimeUtc other)
100 public override bool Equals(object obj)
101 => obj is DateTimeUtc other && this.Equals(other);
103 public override int GetHashCode()
104 => this.datetime.GetHashCode();
106 public override string ToString()
107 => this.ToString("G");
109 public string ToString(string format)
110 => this.ToDateTimeOffset().ToString(format);
112 public string ToLocalTimeString()
113 => this.ToLocalTimeString("G");
115 public string ToLocalTimeString(string format)
116 => this.ToLocalTime().ToString(format);
118 public static DateTimeUtc operator +(DateTimeUtc a, TimeSpan b)
119 => new DateTimeUtc(a.datetime + b);
121 public static DateTimeUtc operator -(DateTimeUtc a, TimeSpan b)
122 => new DateTimeUtc(a.datetime - b);
124 public static TimeSpan operator -(DateTimeUtc a, DateTimeUtc b)
125 => a.datetime - b.datetime;
127 public static bool operator ==(DateTimeUtc a, DateTimeUtc b)
128 => a.datetime == b.datetime;
130 public static bool operator !=(DateTimeUtc a, DateTimeUtc b)
131 => a.datetime != b.datetime;
133 public static bool operator <(DateTimeUtc a, DateTimeUtc b)
134 => a.datetime < b.datetime;
136 public static bool operator <=(DateTimeUtc a, DateTimeUtc b)
137 => a.datetime <= b.datetime;
139 public static bool operator >(DateTimeUtc a, DateTimeUtc b)
140 => a.datetime > b.datetime;
142 public static bool operator >=(DateTimeUtc a, DateTimeUtc b)
143 => a.datetime >= b.datetime;
145 public static DateTimeUtc FromUnixTime(long unixTime)
146 => UnixEpoch + TimeSpan.FromTicks(unixTime * TimeSpan.TicksPerSecond);
148 public static DateTimeUtc Parse(string input, IFormatProvider formatProvider)
149 => new DateTimeUtc(DateTimeOffset.Parse(input, formatProvider, DateTimeStyles.AssumeUniversal));
151 public static bool TryParse(string input, IFormatProvider formatProvider, out DateTimeUtc result)
153 if (DateTimeOffset.TryParse(input, formatProvider, DateTimeStyles.AssumeUniversal, out var datetimeOffset))
155 result = new DateTimeUtc(datetimeOffset);
163 public static bool TryParseExact(string input, string[] formats, IFormatProvider formatProvider, out DateTimeUtc result)
165 if (DateTimeOffset.TryParseExact(input, formats, formatProvider, DateTimeStyles.AssumeUniversal, out var datetimeOffset))
167 result = new DateTimeUtc(datetimeOffset);