Subtract four weeks from current time stamp

Question

long epoch = System.currentTimeMillis() / 1000;
String dateStr = new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'.0Z'").format(new java.util.Date(epoch * 1000));
System.out.println(dateStr);

Can anyone please tell me how to get the time stamp of 4 weeks from the current one? I'm working on payroll testing.

score 5 · Answer 1 · answered Jun 24 '13 at 16:16

5

Subtract the number of milliseconds in 4 weeks from the current time.

long now = System.currentTimeMillis();
long fourWeeksAgo = now - 1000 * 60 * 60 * 24 * 28;

answered Jun 24 '13 at 16:16

brianestey

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While this might work in this particular case, you really should be using a `Calendar`to muck with time/date – Brian Roach Jun 24 '13 at 16:30
Didn't work for me. I'm not sure why. But the subtraction worked as plus. – bonafernando Mar 28 '18 at 21:34
No need to roll your own date-time handling. Use the modern *java.time* classes instead. – Basil Bourque Jun 20 '19 at 20:45

Reimeus · Answer 2 · 2013-06-24T16:39:03.833

3

java.util.Calendar provides a means of manipulating dates so that code is readable:

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.WEEK_OF_YEAR, -4);
long fourWeeksAgo = calendar.getTime().getTime();

edited Jun 24 '13 at 16:39

answered Jun 24 '13 at 16:17

Reimeus

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score 1 · Answer 3 · answered Jun 24 '13 at 16:30

1

java.util.Calendar c = java.util.Calendar.getInstance();
c.add(java.util.Calendar.WEEK_OF_MONTH, -4);

answered Jun 24 '13 at 16:30

Slihp

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Subtract four weeks from current time stamp

3 Answers3