How do I increment a java.sql.Timestamp by 14 days?

Question

I have an app that takes a Timestamp as a boundary for the start date and end date of a sql selection, I want to populate a hashmap with weeks this year since the first mon

Answer 1

java.sql.Timestamp ts = ...
Calendar cal = Calendar.getInstance();
cal.setTime(ts);
cal.add(Calendar.DAY_OF_WEEK, 14);
ts.setTime(cal.getTime().getTime()); // or
ts = new Timestamp(cal.getTime().getTime());

This will correctly cater for daylight-time transitions in your default Timezone. You can tell the Calendar class to use a different Timezone if need be.