Date and time utilities in Java

Adding or subtracting the specific duration from the date

static Calendar calculateDate(String date) {

    
        int durationToBeAddedOrSubtracted;
        Calendar newDate = Calendar.getInstance();


        //-20 years
        durationToBeAddedOrSubtracted = Integer.parseInt(date.split(" ")[0]);
      
        if (date.toLowerCase().contains("months")){
            newDate.add(Calendar.MONTH, durationToBeAddedOrSubtracted);
        } else if (date.toLowerCase().contains("years")){
            newDate.add(Calendar.YEAR, durationToBeAddedOrSubtracted);
        }else{
            newDate.add(Calendar.DATE, durationToBeAddedOrSubtracted);
        }

        return newDate;
    }

Getting the parts from a date in Java.

public void getDateParts(Calendar date){
        String day = String.valueOf(date.get(Calendar.DAY_OF_MONTH));
        String month = String.valueOf(date.get(Calendar.MONTH)+1);
        String year = String.valueOf(date.get(Calendar.YEAR));

        if (day.length()==1){
                    day = "0"+day;
         }
        if (month.length()==1){
                  month = "0"+month;
         }
       
    }

Creating Calendar object from the date parts in Java.
    
           int day = Integer.parseInt(dob[0]);

            int month = Integer.parseInt(dob[1])-1;
            int year = Integer.parseInt(dob[2]);

            Calendar newDate = Calendar.getInstance();
            newDate.set(year, month, day, 0, 0);

   


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