dateFormat function

String dateFormat(DateTime date, List<String> formats)

Implementation

String dateFormat(DateTime date, List<String> formats) {
  final sb = StringBuffer();

  for (String format in formats) {
    if (format == yyyy) {
      sb.write(_digits(date.year, 4));
    } else if (format == yy) {
      sb.write(_digits(date.year % 100, 2));
    } else if (format == mm) {
      sb.write(_digits(date.month, 2));
    } else if (format == m) {
      sb.write(date.month);
    } else if (format == MM) {
      sb.write(monthLong[date.month - 1]);
    } else if (format == M) {
      sb.write(monthShort[date.month - 1]);
    } else if (format == dd) {
      sb.write(_digits(date.day, 2));
    } else if (format == d) {
      sb.write(date.day);
    } else if (format == w) {
      sb.write((date.day + 7) ~/ 7);
    } else if (format == W) {
      sb.write((dayInYear(date) + 7) ~/ 7);
    } else if (format == WW) {
      sb.write(_digits((dayInYear(date) + 7) ~/ 7, 2));
    } else if (format == DD) {
      sb.write(dayLong[date.weekday - 1]);
    } else if (format == D) {
      sb.write(dayShort[date.weekday - 1]);
    } else if (format == HH) {
      sb.write(_digits(date.hour, 2));
    } else if (format == H) {
      sb.write(date.hour);
    } else if (format == hh) {
      int hour = date.hour % 12;
      if (hour == 0) hour = 12;
      sb.write(_digits(hour, 2));
    } else if (format == h) {
      int hour = date.hour % 12;
      if (hour == 0) hour = 12;
      sb.write(hour);
    } else if (format == am) {
      sb.write(date.hour < 12 ? 'AM' : 'PM');
    } else if (format == nn) {
      sb.write(_digits(date.minute, 2));
    } else if (format == n) {
      sb.write(date.minute);
    } else if (format == ss) {
      sb.write(_digits(date.second, 2));
    } else if (format == s) {
      sb.write(date.second);
    } else if (format == SSS) {
      sb.write(_digits(date.millisecond, 3));
    } else if (format == S) {
      sb.write(date.second);
    } else if (format == uuu) {
      sb.write(_digits(date.microsecond, 2));
    } else if (format == u) {
      sb.write(date.microsecond);
    } else if (format == z) {
      if (date.timeZoneOffset.inMinutes == 0) {
        sb.write('Z');
      } else {
        if (date.timeZoneOffset.isNegative) {
          sb.write('-');
          sb.write(_digits((-date.timeZoneOffset.inHours) % 24, 2));
          sb.write(_digits((-date.timeZoneOffset.inMinutes) % 60, 2));
        } else {
          sb.write('+');
          sb.write(_digits(date.timeZoneOffset.inHours % 24, 2));
          sb.write(_digits(date.timeZoneOffset.inMinutes % 60, 2));
        }
      }
    } else if (format == Z) {
      sb.write(date.timeZoneName);
    } else {
      sb.write(format);
    }
  }

  return sb.toString();
}