YearPeriod constructor
A class that implements a period type of a year.
Implementation
YearPeriod({required super.start, required super.end})
: assert(
end.difference(start) <=
const Duration(
days: 365,
hours: 23,
minutes: 59,
seconds: 59,
milliseconds: 999,
microseconds: 999,
),
'The difference between start and end must be 365 days, 23 hours, '
'59 minutes, 59 seconds, 999 milliseconds and 999 microseconds',
) {
const microsecond = Duration(microseconds: 1);
if (!start.isAtSameYearAs(end) ||
end.add(microsecond).isAtSameYearAs(start) ||
(start.exactTimeOfDay != Duration.zero) ||
(end.exactTimeOfDay != end.endOfDay.exactTimeOfDay) ||
start.isAtSameMonthAs(end) ||
(start.firstDayOfMonth != start) ||
(end.lastDayOfMonth.endOfDay != end) ||
((end.month - start.month) != 11)) {
throw ArgumentError.value(
end,
'end',
'End must be at the same year as start and must be the last '
'microsecond of the year',
);
}
}