var today = DateTime.now();

print('当前时间是：$today');

var date1 = today.millisecondsSinceEpoch;

print('当前时间戳：$date1');

var date2 = DateTime.fromMillisecondsSinceEpoch(date1);

print('时间戳转日期：$date2');

//拼接成date

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

print(dentistAppointment);

// 字符串转date

DateTime date3 = DateTime.parse("2019-06-20 15:32:41");

print(date3);

// 时间比较

print(today.isBefore(date3));// 在之前

print(today.isAfter(date3)); // 在之后

print(date3.isAtSameMomentAs(date3));// 相同

print(date3.compareTo(today));// 大于返回1；等于返回0；小于返回-1。

// print(DateTime.now().toString());

// print(DateTime.now().toIso8601String());

//时间增加

var fiftyDaysFromNow = today.add(new Duration(days: 5));

print('today加5天：$fiftyDaysFromNow');

//时间减少

DateTime fiftyDaysAgo = today.subtract(new Duration(days: 5));

print('today减5天：$fiftyDaysAgo');

//时间差 两个时间相差 小时数

print('比较两个时间 差 小时数：${fiftyDaysFromNow.difference(fiftyDaysAgo)}');

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

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

print('获取年月日：${today.year}');//month、day、hour、minute、second、millisecond、microsecond

print('星期：${today.weekday}');// 返回星期几