Unity/Csharp/日時

日時表示

DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"); // HHにすると24時間表記となる
2019-02-28 22:57:20
DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"); // hhにすると12時間表記となる
2019-02-28 10:57:20

using System;
string GetYmdHm() {
		string h = ("0" + System.DateTime.Now.Hour.ToString ());
		string i = ("0" + System.DateTime.Now.Minute.ToString ());
		return System.DateTime.Now.Year.ToString() + "-" +
			System.DateTime.Now.Month.ToString() + "-" +
			System.DateTime.Now.Day.ToString() + " " +
			h.Substring(h.Length - 2, 2) + ":" +
			i.Substring(i.Length - 2, 2);
}

日付入力

var dt = new DateTime( 2022, 1, 26, 10, 20, 30 );
Debug.Log(dt.ToString()); // 1/26/2022 10:20:30 PM

時間表示

using System;
DateTime.Now.ToString("T")
> 16:12:10

日付フォーマット一覧

https://msdn.microsoft.com/ja-jp/library/k494fzbf(v=VS.80).aspx

d :08/17/2000
D :Thursday, August 17, 2000
f :Thursday, August 17, 2000 16:32
F :Thursday, August 17, 2000 16:32:32
g :08/17/2000 16:32
G :08/17/2000 16:32:32
m :August 17
r :Thu, 17 Aug 2000 23:32:32 GMT
s :2000-08-17T16:32:32
t :16:32
T :16:32:32
u :2000-08-17 23:32:32Z
U :Thursday, August 17, 2000 23:32:32
y :August, 2000
dddd, MMMM dd yyyy :Thursday, August 17 2000
ddd, MMM d "'"yy :Thu, Aug 17 '00
dddd, MMMM dd :Thursday, August 17
M/yy :8/00
dd-MM-yy :17-08-00

unixtimeを取得

var now = DateTime.UtcNow;
long unixtime = (long)(now - new DateTime(1970, 1, 1)).TotalSeconds;

unixtimeとDatetime変換

https://gist.github.com/YuukiTsuchida/06ca3a1f0baf755651b0#file-unixtime

秒を時分秒へ

int sec = 3666;
string his = string.Format("{0:00}:{1:00}:{2:00}", (sec / 60 / 60), (sec / 60) % 60, sec % 60);
Debug.Log("his=" + his);  // 01:01:06

参考：https://cms.shise.net/2014/10/sec-num-format/

差分秒数

12:30ぐらいだったとき、300秒と出る

static DateTime targetDateTime = new DateTime(2022, 1, 26, 12, 35, 0);
TimeSpan ts = targetDateTime - DateTime.Now;
Debug.Log("diff sec=" + ts.TotalSeconds);

タイムゾーン付き日付

year = 2022;
month = 2;
day = 28;
hour = 12;
minute = 59;
second = 30;
var dateTime = new DateTimeOffset(
                year,
                month,
                day,
                hour,
                minute,
                second,
                new TimeSpan(9, 0, 0)
                );
Debug.Log(dateTime.ToString("yyyy-MM-dd HH:mm:ss")); // 2022/2/28 12:59:30
// Utcに変換
dateTime = dateTime.ToUniversalTime();
Debug.Log(dateTime.ToString("yyyy-MM-dd HH:mm:ss")); // 2022/2/28 3:59:30
// 現在と比較
TimeSpan ts = dateTime - DateTime.UtcNow; // 過ぎてたら、マイナスになる
// 現在との秒数差分
Debug.Log(ts.TotalSeconds); 16.383