update method
Update Date
Implementation
DateTime? update(String key, int value) {
switch (key) {
case "minute":
return DateTime(this.year, this.month, this.day, this.hour, value);
case "hour":
return DateTime(this.year, this.month, this.day, value, this.minute);
case "day":
return DateTime(this.year, this.month, value, this.hour, this.minute);
case "month":
return DateTime(this.year, value, this.day, this.hour, this.minute);
case "year":
return DateTime(value, this.month, this.day, this.hour, this.minute);
default:
return null;
}
}