HoraTimezone.fromOffset constructor

HoraTimezone.fromOffset(int hours, { int minutes = 0, String? name, })

Creates a timezone from UTC offset hours and minutes.

Implementation

factory HoraTimezone.fromOffset(
  int hours, {
  int minutes = 0,
  String? name,
}) {
  if (hours.abs() > 23) {
    throw ArgumentError.value(
      hours,
      'hours',
      'Timezone hour offset must be in -23..23.',
    );
  }
  if (minutes.abs() > 59) {
    throw ArgumentError.value(
      minutes,
      'minutes',
      'Timezone minute offset must be in -59..59.',
    );
  }
  if (hours != 0 &&
      minutes != 0 &&
      ((hours > 0 && minutes < 0) || (hours < 0 && minutes > 0))) {
    throw ArgumentError.value(
      minutes,
      'minutes',
      'Minute offset sign must match hour offset sign.',
    );
  }

  final totalMinutes = switch ((hours, minutes)) {
    (0, final m) => m,
    (final h, final m) when h < 0 => h * 60 - m.abs(),
    (final h, final m) => h * 60 + m.abs(),
  };

  return HoraTimezone.fromMinutes(totalMinutes, name: name);
}