Flutter – unable to convert string date in Format yyyyMMddHHmmss to DateTime dart

You can use the intl package (installer) to format dates.

For en_US formats, it's quite simple:

import 'package:intl/intl.dart';

main() {
  final DateTime now = DateTime.now();
  final DateFormat formatter = DateFormat('yyyy-MM-dd');
  final String formatted = formatter.format(now);
  print(formatted); // something like 2013-04-20
}

There are many options for formatting. From the docs:

ICU Name                   Skeleton
--------                   --------
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

For non-en_US dates, you need to explicitly load in the locale. See the DateFormat docs for more info. The date_symbol_data_local.dart contains all of the formats for each country/language, if you would like a more in-depth look.

I know this is already answered, but in case someone wants to use the actual device locale and not a hard-coded one:

DateFormat.yMMMd(Localizations.localeOf(context).languageCode).format(result);

Important, you need to pass a String and not a Locale object here.

If you want to have a custom date format, then you need to create your own switch/case based on all the locales you want to support.