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Flutter?DateTime日期轉(zhuǎn)換的詳細(xì)使用_Android

作者：CodeCiCi ? 更新時(shí)間： 2022-07-06 編程語(yǔ)言

1.日期轉(zhuǎn)換成時(shí)間戳

var now=new DateTime.now();
print(now.millisecondsSinceEpoch); //單位毫秒，13位時(shí)間戳

2.時(shí)間戳轉(zhuǎn)換成日期

var now=new DateTime.now();
var a=now.millisecondsSinceEpoch; // 時(shí)間戳*
print(DateTime.fromMillisecondsSinceEpoch(a));

3.創(chuàng)建指定時(shí)間?

DateTime assignDay = new DateTime(2020,10,10);
print(assignDay);   // 2020-10-10 00:00:00.000

4.計(jì)算時(shí)間跨度

// 例如計(jì)算1天14小時(shí)45分的跨度
Duration timeRemaining = new Duration(days:1, hours:14, minutes:45);
print(timeRemaining);  // 38:45:00.000000

5.字符串轉(zhuǎn)DateTime

DateTime.parse('2019-11-08') 
//或者 
DateTime.parse('2019-11-08 12:30:05')

6.在之前——時(shí)間比較

var today = DateTime.now();
var date = DateTime.parse("2019-06-20 15:32:41");
today.isBefore(date);

7.在之后——時(shí)間比較

var today = DateTime.now();
var date = DateTime.parse("2019-06-20 15:32:41");
today.isAfter(date);

8.相等——時(shí)間比較

var today = DateTime.now();
var date = DateTime.parse("2019-06-20 15:32:41");
today.isAtSameMomentAs(date);

9.時(shí)間增加

var today = DateTime.now();   // 2019-11-08 02:54:53.218443
var fiftyDaysFromNow = today.add(new Duration(days: 5));
print('today加5天：$fiftyDaysFromNow');  // today加5天：2019-11-13 02:54:53.218443

10.時(shí)間減少

var today = DateTime.now();   // 2019-11-08 02:54:53.218443
var fiftyDaysAgo = today.add(new Duration(days: 5));

print('today加5天：$fiftyDaysAgo ');  // today減5天：2019-11-03 02:54:53.218443

11.時(shí)間差(小時(shí)數(shù))

var day1 = new DateTime(2019, 6, 20, 17, 30, 20);

var day2 = new DateTime(2019, 7, 21, 0,  0, 0);

print('比較兩個(gè)時(shí)間 差 小時(shí)數(shù)：${day1.difference(day2)}');  //  比較兩個(gè)時(shí)間 差 小時(shí)數(shù)：-726:29:40.000000

12.獲取年、月、日、星期、時(shí)、分、秒、毫秒、微妙

year、month、day、weekday、hour、minute、second、millisecond、microsecond

var today = DateTime.now();

print(today.year);

13.獲取本地時(shí)區(qū)簡(jiǎn)碼

DateTime today = DateTime.now();

print('本地時(shí)區(qū)簡(jiǎn)碼：${today.timeZoneName}');  //  本地時(shí)區(qū)簡(jiǎn)碼：GMT

14.返回UTC與本地時(shí)差(小時(shí)數(shù)）

DateTime today = DateTime.now();
print('返回UTC與本地時(shí)差 小時(shí)數(shù)：${today.timeZoneOffset}');

原文鏈接：https://juejin.cn/post/7096078144565673991

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