Flutter DateTime日期转换的详细使用

var now=new DateTime.now();
print(now.millisecondsSinceEpoch); //单位毫秒，13位时间戳

var now=new DateTime.now();
var a=now.millisecondsSinceEpoch; // 时间戳*
print(DateTime.fromMillisecondsSinceEpoch(a));

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

// 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

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

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

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

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

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

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 02:54:53.218443

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

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

var today = DateTime.now();

print(today.year);

DateTime today = DateTime.now();

print('本地时区简码：${today.timeZoneName}');  //  本地时区简码：GMT

DateTime today = DateTime.now();
print('返回UTC与本地时差 小时数：${today.timeZoneOffset}');