range method
Implementation
DateTimeRange range(Duration duration) {
final date = add(duration);
return date > this
? DateTimeRange(start: this, end: date)
: DateTimeRange(start: date, end: this);
}
DateTimeRange range(Duration duration) {
final date = add(duration);
return date > this
? DateTimeRange(start: this, end: date)
: DateTimeRange(start: date, end: this);
}