Flutter 日期操作函数

flutter中日期的比较比较方便，可以通过difference方法来实现，示例代码如下：

//出生日期

final birthday = DateTime(1988, 10, 12);

//当前日期

final date2 = DateTime.now();

//比较相差的天数

final difference = date2.difference(birthday).inDays;

Flutter DateTime日期时间　常用操作方法

1、获取当前时间

var now = new DateTime.now(); print(now); // 2019-06-20 16:59:05.560543

2、设置时间

var d =new DateTime(2019, 6, 20, 16, 37 , 26); print(d); // 2019-06-20 16:37:26.000

3、创建时间UTC

var ds = new DateTime.utc(2019, 10, 10, 9, 30); print(ds); // 2019-10-10 09:30:00.000Z

4、解析时间

var d1 = DateTime.parse('2018-10-10 09:30:36');

print(d1); // 2018-10-10 09:30:36.000

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

print(d2); // 2018-10-10 01:30:30.000Z

5、时间加减

print(now.add(new Duration(minutes: 10)));//加10分钟 2019-06-20 17:09:05.560543

print(now.add(new Duration(minutes: -10)));//减10分钟 2019-06-20 16:49:05.560543

print(now.add(new Duration(hours: 2)));//加2小时 2019-06-20 18:59:05.560543

print(now.add(new Duration(hours: -2)));//减2小时 2019-06-20 14:59:05.560543

6、比较时间

var d3 = new DateTime(2019, 6, 20);

var d4 = new DateTime(2019, 7, 20);

var d5 = new DateTime(2019, 6, 20);

print(d3.isAfter(d4));//是否在d4之后 false

print(d3.isBefore(d4));//是否在d4之前 true

print(d3.isAtSameMomentAs(d5));//是否相同 true

7、计算时间差

var d6 = new DateTime(2019, 6, 19, 16 , 30);

var d7 = new DateTime(2019, 6, 20, 15, 20);

var difference = d7.difference(d6);

print([difference.inDays, difference.inHours,difference.inMinutes]);

//d6与d7相差的天数与小时,分钟 [0, 22, 1370]

8、时间戳

print(now.millisecondsSinceEpoch);//单位毫秒，13位时间戳 1561021145560

print(now.microsecondsSinceEpoch);//单位微秒，16位时间戳 1561021145560543

9、打印当前时间

// padLeft(int width,String sring)：如果字符串长度小于width，在左边填充sring

print("${now.year.toString()}-${now.month.toString().padLeft(2,'0')}-${now.day.toString().padLeft(2,'0')} ${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}:${now.second.toString().padLeft(2, '0')}");

// 2019-06-20 16:59:05

Flutter 时间戳转换成时间 时间字符串转换成时间戳

DateTime time=DateTime.now();