Flutter DateTime日期转换的详细使用

目录
1.日期转换成时间戳
2.时间戳转换成日期
3.创建指定时间
4.计算时间跨度
5.字符串转DateTime
6.在之前——时间比较
7.在之后——时间比较
8.相等——时间比较
9.时间增加
10.时间减少
11.时间差(小时数)
12.获取年、月、日、星期、时、分、秒、毫秒、微妙
13.获取本地时区简码
14.返回UTC与本地时差(小时数）

1.日期转换成时间戳
var now=new DateTime.now();print(now.millisecondsSinceEpoch); //单位毫秒，13位时间戳
2.时间戳转换成日期
var now=new DateTime.now();var a=now.millisecondsSinceEpoch; // 时间戳*print(DateTime.fromMillisecondsSinceEpoch(a));
3.创建指定时间
DateTime assignDay = new DateTime(2020,10,10);print(assignDay);   // 2020-10-10 00:00:00.000
4.计算时间跨度
// 例如计算1天14小时45分的跨度Duration timeRemaining = new Duration(days:1, hours:14, minutes:45);print(timeRemaining); // 38:45:00.000000
5.字符串转DateTime
DateTime.parse('2019-11-08') //或者 DateTime.parse('2019-11-08 12:30:05')
6.在之前——时间比较
var today = DateTime.now();var date = DateTime.parse("2019-06-20 15:32:41");today.isBefore(date);
7.在之后——时间比较
var today = DateTime.now();var date = DateTime.parse("2019-06-20 15:32:41");today.isAfter(date);
8.相等——时间比较
var today = DateTime.now();var date = DateTime.parse("2019-06-20 15:32:41");today.isAtSameMomentAs(date);
9.时间增加
var today = DateTime.now(); // 2019-11-08 02:54:53.218443var 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.时间减少
`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减5天：2019-11-03 02:54:53.21844311.时间差(小时数)var day1 = new DateTime(2019, 6, 20, 17, 30, 20);

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

print(‘比较两个时间差小时数：${day1.difference(day2)}’); // 比较两个时间差小时数：-726:29:40.000000
12.获取年、月、日、星期、时、分、秒、毫秒、微妙year、month、day、weekday、hour、minute、second、millisecond、microsecond

var today = DateTime.now();

print(today.year);13.获取本地时区简码DateTime today = DateTime.now();

print(‘本地时区简码：${today.timeZoneName}’); // 本地时区简码：GMT14.返回UTC与本地时差(小时数）DateTime today = DateTime.now();
print(‘返回UTC与本地时差小时数：${today.timeZoneOffset}’);`

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