日期时间

声明

• 当前时间

var now = new DateTime.now();
print(now);

2022-05-28 20:04:43.607

• 指定年月日

var d = new DateTime(2018, 10, 10, 9, 30);
print(d);

2018-10-10 09:30:00.000

创建时间 UTC

• UTC 协调世界时

• 原子时

• 原子钟

• 时区表

• 创建 utc 时间

var d = new DateTime.utc(2018, 10, 10, 9, 30);
print(d);

2018-10-10 09:30:00.000Z

解析时间 IOS 8601

• ISO 8601

• 时区

• 时区列表

• 如果时间在零时区

var d1 = DateTime.parse('2018-10-10 09:30:30Z');
print(d1);

2018-10-10 09:30:30.000Z

var d2 = DateTime.parse('2018-10-10 09:30:30+0800');
print(d2);

2018-10-10 01:30:30.000Z

时间增减量

var d1 = DateTime.now();
print(d1);
print(d1.add(new Duration(minutes: 5)));
print(d1.add(new Duration(minutes: -5)));

2022-05-28 22:09:12.805
2022-05-28 22:14:12.805
2022-05-28 22:04:12.805

比较时间

var d1 = new DateTime(2018, 10, 1);
var d2 = new DateTime(2018, 10, 10);
print(d1.isAfter(d2));
print(d1.isBefore(d2));

false
true

var d1 = DateTime.now();
var d2 = d1.add(new Duration(milliseconds: 30));
print(d1.isAtSameMomentAs(d2));

false

时间差

var d1 = new DateTime(2018, 10, 1);
var d2 = new DateTime(2018, 10, 10);
var difference = d1.difference(d2);
print([difference.inDays, difference.inHours]);

[-9, -216]

时间戳

• 公元

var now = new DateTime.now();
print(now.millisecondsSinceEpoch);
print(now.microsecondsSinceEpoch);

1653747090687
1653747090687000