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 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(DateTime datetime)
68 if (datetime.Kind != DateTimeKind.Utc)
69 throw new ArgumentException("datetime には UTC に変換された時刻が必須です", nameof(datetime));
71 this.datetime = datetime;
74 public long ToUnixTime()
75 => (long)((this - UnixEpoch).TotalSeconds);
77 public DateTimeOffset ToDateTimeOffset()
78 => new DateTimeOffset(this.datetime);
80 public DateTimeOffset ToLocalTime()
81 => this.ToDateTimeOffset().ToLocalTime();
83 public DateTime ToDateTimeUnsafe()
86 public int CompareTo(DateTimeUtc other)
87 => this.datetime.CompareTo(other.datetime);
89 public bool Equals(DateTimeUtc other)
92 public override bool Equals(object obj)
93 => obj is DateTimeUtc other && this.Equals(other);
95 public override int GetHashCode()
96 => this.datetime.GetHashCode();
98 public override string ToString()
99 => this.ToString("G");
101 public string ToString(string format)
102 => this.ToDateTimeOffset().ToString(format);
104 public string ToLocalTimeString()
105 => this.ToLocalTimeString("G");
107 public string ToLocalTimeString(string format)
108 => this.ToLocalTime().ToString(format);
110 public static DateTimeUtc operator +(DateTimeUtc a, TimeSpan b)
111 => new DateTimeUtc(a.datetime + b);
113 public static DateTimeUtc operator -(DateTimeUtc a, TimeSpan b)
114 => new DateTimeUtc(a.datetime - b);
116 public static TimeSpan operator -(DateTimeUtc a, DateTimeUtc b)
117 => a.datetime - b.datetime;
119 public static bool operator ==(DateTimeUtc a, DateTimeUtc b)
120 => a.datetime == b.datetime;
122 public static bool operator !=(DateTimeUtc a, DateTimeUtc b)
123 => a.datetime != b.datetime;
125 public static bool operator <(DateTimeUtc a, DateTimeUtc b)
126 => a.datetime < b.datetime;
128 public static bool operator <=(DateTimeUtc a, DateTimeUtc b)
129 => a.datetime <= b.datetime;
131 public static bool operator >(DateTimeUtc a, DateTimeUtc b)
132 => a.datetime > b.datetime;
134 public static bool operator >=(DateTimeUtc a, DateTimeUtc b)
135 => a.datetime >= b.datetime;
137 public static DateTimeUtc FromUnixTime(long unixTime)
138 => UnixEpoch + TimeSpan.FromTicks(unixTime * TimeSpan.TicksPerSecond);
140 public static DateTimeUtc Parse(string input, IFormatProvider formatProvider)
141 => new DateTimeUtc(DateTimeOffset.Parse(input, formatProvider, DateTimeStyles.AssumeUniversal));
143 public static bool TryParse(string input, IFormatProvider formatProvider, out DateTimeUtc result)
145 if (DateTimeOffset.TryParse(input, formatProvider, DateTimeStyles.AssumeUniversal, out var datetimeOffset))
147 result = new DateTimeUtc(datetimeOffset);
155 public static bool TryParseExact(string input, string[] formats, IFormatProvider formatProvider, out DateTimeUtc result)
157 if (DateTimeOffset.TryParseExact(input, formats, formatProvider, DateTimeStyles.AssumeUniversal, out var datetimeOffset))
159 result = new DateTimeUtc(datetimeOffset);