Question

So the problem is I have got a date from server and I want to add specific days based on the difference between the current date and the date that I have got from the server.

serverDate – currentDate

Working: This is how I calculate the difference between days,

String s=formater.format(currentDate);
long d1 = formater.parse(s).getTime();
long d2=formater.parse(serverDate).getTime();
int totaldays=(int)Math.abs((d1-d2)/(1000*60*60*24));

Working: To make a date added with 5 days from the current date,

    if(totaldays==5)
        {
        Calendar c=Calendar.getInstance();
        c.add(Calendar.DATE, 0);
        System.out.println("value of new server date "+c.getTime());
        }

   else if(totaldays==4)
        {
        Calendar c=Calendar.getInstance();
        c.add(Calendar.DATE, 1);
        System.out.println("value of new server date "+c.getTime());
        }

else if(totaldays==3)
        {
        Calendar c=Calendar.getInstance();
        c.add(Calendar.DATE, 2);
        System.out.println("value of date "+c.getTime());
        }

else if(totaldays==2)
        {
        Calendar c=Calendar.getInstance();
        c.add(Calendar.DATE, 3);
        System.out.println("value of new server date "+c.getTime());
        }

else if(totaldays==1)
        {
        Calendar c=Calendar.getInstance();
        c.add(Calendar.DATE, 4);
        System.out.println("value of new server date "+c.getTime());
        }

else if(totaldays==0)
            {
            Calendar c=Calendar.getInstance();
            c.add(Calendar.DATE, 0);
            System.out.println("value of new server date "+c.getTime());
            }

Eventually: I might need to modify this use case with a difference of total days to a large number so, in that case would I need to increase the number of comparisons or is there any trick that I can use to reach a specific date.

Answer 1

ok, from the comments of the question, I try to rephrase a bit the requirement:

totaldays (gap) is difference between serverDate and currentDate

• if gap<5, making the gap become 5
• if gap=5, do nothing
• if gap>5, add gap to serverDate

if the what was written above is true

• 1st calculate the totaldays

then one line would solve your problem:

c.add(Calendar.DATE, totaldays>5?totaldays:5-totaldays);

btw, you should clearly describe what you need in your question. Good luck!