Add 1 Week to a Date, which way is preferred?

Question

I am reviewing some code at work and came across an inconsistency in how the code handles adding 1 week to the current time and was wondering if there was any reason why one

Answer 1

Since you're using it on the mobile device, the first method is preferable. The reason is that your code should be independent of specific calendar, DST and other problems, such as seconds overrun(leap seconds).

You have to remove dependence on GregorianCalendar and create it using Calendar.getInstance().