subtractTime method

Implementation

DateTime subtractTime({int years=0,int months=0,int days=0,int hours=0,int minutes=0,int seconds=0,int microseconds=0}){
  Moment dateTime=Moment(this);
  if(years!=0){
    dateTime=Moment(DateTime(dateTime.year+years,dateTime.month,dateTime.day,dateTime.hour,dateTime.minute,dateTime.second,dateTime.millisecond,dateTime.microsecond));
  }
  if(months!=0){
    int year=dateTime.year;
    int addMonths=(months/12) as int;
    year-=addMonths;
    months=months%12;
    int month=dateTime.month-months;
    if(month<1){
      year--;
      month=month+12;
    }
    dateTime=Moment(DateTime(year,month,dateTime.day,dateTime.hour,dateTime.minute,dateTime.second,dateTime.millisecond,dateTime.microsecond));
  }
  if(days!=0){
    dateTime=dateTime.subtract(Duration(days: days));
  }
  if(hours!=0){
    dateTime=dateTime.subtract(Duration(hours: hours));
  }
  if(minutes!=0){
    dateTime=dateTime.subtract(Duration(minutes: minutes));
  }
  if(seconds!=0){
    dateTime=dateTime.subtract(Duration(seconds: seconds));
  }
  if(microseconds!=0){
    dateTime=dateTime.subtract(Duration(microseconds: microseconds));
  }
  return dateTime;
}