کار با تاریخ در دارت با کلاس DateTime

print(DateTime.now()); // 2020–04–02 13:49:46.635

var currDt = DateTime.now();
print(currDt.year); // 4
print(currDt.weekday); // 4
print(currDt.month); // 4
print(currDt.day); // 2
print(currDt.hour); // 15
print(currDt.minute); // 21
print(currDt.second); // 49

var addDt = DateTime.now();
print(addDt.add(Duration(days: 5, hours: 5, minutes: 30))); //2020–04–07 21:02:09.367

var anotherDt = DateTime.now().subtract(Duration(days: 10, hours: 10));
print(addDt.isAfter(anotherDt)); // true

var subDt = DateTime.now().subtract(Duration(days: 10, hours: 10));
print(addDt.isBefore(subDt)); // false

var diffDt = addDt.difference(subDt); // 249:59:59.999000
print(diffDt.inSeconds);
print(diffDt.inHours);
print(diffDt.inMinutes);
print(diffDt.inDays);

print(addDt.isAtSameMomentAs(anotherDt)); // false

String strDt = "1984–04–02";
DateTime parseDt = DateTime.parse(strDt);
print(parseDt); // 1984–04–02 00:00:00.000

var newFormat = DateFormat("yy-MM-dd");
String updatedDt = newFormat.format(dt);
print(updatedDt); // 20-04-03

DAY                          d
 ABBR_WEEKDAY                 E
 WEEKDAY                      EEEE
 ABBR_STANDALONE_MONTH        LLL
 STANDALONE_MONTH             LLLL
 NUM_MONTH                    M
 NUM_MONTH_DAY                Md
 NUM_MONTH_WEEKDAY_DAY        MEd
 ABBR_MONTH                   MMM
 ABBR_MONTH_DAY               MMMd
 ABBR_MONTH_WEEKDAY_DAY       MMMEd
 MONTH                        MMMM
 MONTH_DAY                    MMMMd
 MONTH_WEEKDAY_DAY            MMMMEEEEd
 ABBR_QUARTER                 QQQ
 QUARTER                      QQQQ
 YEAR                         y
 YEAR_NUM_MONTH               yM
 YEAR_NUM_MONTH_DAY           yMd
 YEAR_NUM_MONTH_WEEKDAY_DAY   yMEd
 YEAR_ABBR_MONTH              yMMM
 YEAR_ABBR_MONTH_DAY          yMMMd
 YEAR_ABBR_MONTH_WEEKDAY_DAY  yMMMEd
 YEAR_MONTH                   yMMMM
 YEAR_MONTH_DAY               yMMMMd
 YEAR_MONTH_WEEKDAY_DAY       yMMMMEEEEd
 YEAR_ABBR_QUARTER            yQQQ
 YEAR_QUARTER                 yQQQQ
 HOUR24                       H
 HOUR24_MINUTE                Hm
 HOUR24_MINUTE_SECOND         Hms
 HOUR                         j
 HOUR_MINUTE                  jm
 HOUR_MINUTE_SECOND           jms
 HOUR_MINUTE_GENERIC_TZ       jmv
 HOUR_MINUTE_TZ               jmz
 HOUR_GENERIC_TZ              jv
 HOUR_TZ                      jz
 MINUTE                       m
 MINUTE_SECOND                ms
 SECOND                       s