formatDate function

String formatDate({ required DateTime date, String format = 'MMDDYYYY', String divider = '/', })

Formats DateTime into a # string with the date.

Ex. output is "12/04/2019".

Can be given 'MM' 'DD' and 'YYYY' OR 'YY' in any order for format (ex. 'MMDDYY' 'YYYYDDMM' 'DDYYYYMM' 'MMDD' 'MMYYYY').

Can be given any divider (ex. '/' ':' '.').

Implementation

String formatDate(
    {required DateTime date,
    String format = 'MMDDYYYY',
    String divider = '/'}) {
  var day = date.day;
  var month = date.month;
  var year = date.year;
  var returner = '';
  var isLastYear = false;
  for (var l = 0; l < format.length; l += 2) {
    if (l != 0) {
      returner = returner + divider;
    }
    switch (format[l]) {
      case 'M':
        {
          isLastYear = false;
          if (month >= 10) {
            returner = returner + '$month';
          } else {
            returner = returner + '0$month';
          }
        }
        break;
      case 'D':
        {
          isLastYear = false;
          if (day >= 10) {
            returner = returner + '$day';
          } else {
            returner = returner + '0$day';
          }
        }
        break;
      case 'Y':
        {
          if (!isLastYear) {
            if (int.parse(year.toString().substring(2)) >= 10) {
              returner = returner + year.toString().substring(2);
            } else {
              returner = returner + '0' + year.toString().substring(2);
            }
            isLastYear = true;
          } else {
            returner = returner.substring(0, returner.length - 3) + '$year';
            isLastYear = true;
          }
        }
        break;
      default:
        {
          throw ArgumentError('Invalid format passed!');
        }
    }
  }
  return returner;
}