how to get the timestamp of previous dates in java?

Question

In my shopping cart application, I am storing all the purchase dates in timestamp.

Suppose, I want to get the timestamp of purchase date n days before (n is configurable). How will I get it using java?

example: something like purchasedateBefore5days = currentTimestamp_in_days - 5; I am getting current timestamp using

long currentTimestamp = Math.round(System.currentTimeMillis() / 1000);

How can i subtract n days from it. I am a beginner. Please help on this.

score 10 · Accepted Answer · answered Jun 18 '13 at 11:33

10

Use the Calendar class:

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, -5);
long fiveDaysAgo = cal.getTimeInMillis();

answered Jun 18 '13 at 11:33

cmbaxter

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Is it possible to calculate 5 day before and after at the same time with single instance of Calendar? – Amir Jun 07 '16 at 16:43

AllTooSir · Answer 2 · 2013-06-18T11:38:13.133

You can use the Calendar class in Java , use its set() method to add/subtract the required number of days from the Calendar.DATE field.

To subtract n days from today , Use c.get(Calendar.DATE)-n. Sample code :

Calendar c = Calendar.getInstance();
System.out.println(c.getTime()); // Tue Jun 18 17:07:45 IST 2013
c.set(Calendar.DATE, c.get(Calendar.DATE)-5);
System.out.println(c.getTime()); // Thu Jun 13 17:07:45 IST 2013

score 1 · Answer 3 · edited May 23 '17 at 10:29

1

Date d = initDate();//intialize your date to any date 
Date dateBefore = new Date(d.getTime() - n * 24 * 3600 * 1000 ); //Subtract n days

Also possible duplicate .

edited May 23 '17 at 10:29

Community

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answered Jun 18 '13 at 11:30

voidMainReturn

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score 1 · Answer 4 · answered Jun 18 '13 at 11:31

1

That currentTimestamp must be passed to a Calendar instance. from Calendar you can subtract X days. Get the milliseconds from calendar and is done.

answered Jun 18 '13 at 11:31

score 1 · Answer 5 · answered Jun 18 '13 at 11:31

1

You can play aorund with the following code snippet, to form it the way you want:

Calendar c = Calendar.getInstance();
c.setTimeInMillis(milliSeconds);
c.add(Calendar.DATE, -5);

Date date = c.getTime();

answered Jun 18 '13 at 11:31

Peter Jaloveczki

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bNd · Answer 6 · 2013-06-18T11:38:09.650

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  Calendar calendar=Calendar.getInstance();
  calendar.add(Calendar.DATE, -5);

using Java.util.Calendar Class

Calendar.DATE

This is the field number for get and set indicating the day of the month. , to subtract 5 days from the current time of the calendar, you can achieve it by calling.

edited Jun 18 '13 at 11:38

answered Jun 18 '13 at 11:32

bNd

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score 0 · Answer 7 · answered Jun 18 '13 at 12:02

0

Try this..

long timeInMillis = System.currentTimeMillis();

Calendar cal = Calendar.getInstance();

cal.setTimeInMillis(timeInMillis);

cal.set(Calendar.DATE, cal.get(Calendar.DATE)-5);

java.util.Date date1 = cal.getTime();

System.out.println(date1);

answered Jun 18 '13 at 12:02

Anand Devaraj

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how to get the timestamp of previous dates in java?

7 Answers7