How to subtract an hour from current timestamp

Question

How to subtract an hour from current time-stamp?

Calendar c = Calendar.getInstance();
System.out.println("current: "+c.getTime());

score 8 · Answer 1 · edited Aug 02 '17 at 15:35

8

Add -1 to the Calendar.HOUR attribute:

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.HOUR, -1);

Oh! And with Joda Time, there you go:

DateTime date = DateTime.now();
DateTime dateOneHourBack = date.minusHours(1);

Although difference might not be visible here, but it's a much more simple and better API than Date and Calendar in JDK.

edited Aug 02 '17 at 15:35

Sieva Kimajeŭ

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answered Oct 11 '13 at 05:14

Rohit Jain

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score 1 · Answer 2 · answered Oct 11 '13 at 05:17

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The answer you are looking for is

cal.add(Calendar.HOUR, -numberOfHours);

where numberOfHours is the amount you want to subtract.

You can also refer this link for more information

http://examples.javacodegeeks.com/core-java/util/calendar/add-subtract-hours-from-date-with-calendar/

answered Oct 11 '13 at 05:17

Rupesh

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when there is already an answer please upvote the other answer if it answers the question instead of giving the same answer. – Thirumalai Parthasarathi Oct 11 '13 at 06:03
Please stop worrying about upvote, downvote and extra answers in this post. People are here to help and everybody is trying 100% to help others. Why crib? If you have concerns please reach out to site moderators and they will surely help you out. But please stop making such comments that have no value at all to this post. No offense meant I know your intent is good. – Rupesh Oct 11 '13 at 06:10
none taken. But the upvote and downvote buttons are provided for a purpose and i am sure people are trying 100% to help and help indeed should be provided in the right manner. typing-in the same answer again is of no use. i hope you understand what i mean. i know my comment does not add any value to this post but it just expresses the site's policy. – Thirumalai Parthasarathi Oct 11 '13 at 06:34
pay a visit [**here**](http://stackoverflow.com/help/deleted-answers) – Thirumalai Parthasarathi Oct 11 '13 at 06:38

score 1 · Answer 3 · edited May 03 '16 at 03:25

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Calendar cal = Calendar.getInstance();
cal.add(Calendar.HOUR_OF_DAY, -1);

edited May 03 '16 at 03:25

Box Box Box Box

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answered Oct 11 '13 at 05:22

pnathan

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when there is already an answer please upvote the other answer if it answers the question instead of giving the same answer. – Thirumalai Parthasarathi Oct 11 '13 at 06:03

score 0 · Answer 4 · answered Oct 11 '13 at 05:16

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Add -1

add(int field,int amount) Adds or subtracts the specified amount of time to the given calendar field, based on the calendar's rules. For example, to subtract 1 hours from the current time of the calendar, you can achieve it by calling:

Calendar cal = Calendar.getInstance();
cal.add(Calendar.HOUR, -1);

answered Oct 11 '13 at 05:16

BBdev

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and how is it different or useful than the other answer.? – Thirumalai Parthasarathi Oct 11 '13 at 05:17
I didnt notice when i was posting my answer that there is answer has been posted. Was that wrong why downvoted:( – BBdev Oct 11 '13 at 05:21
i didnt downvote.. someother guy might have... when there is already an answer please upvote the other answer if it answers the question. – Thirumalai Parthasarathi Oct 11 '13 at 06:00
Thats right @BlackPanther but when i was answering there was no answer .I still dont know the reason of downvote. – BBdev Oct 11 '13 at 10:32

score 0 · Answer 5 · answered Oct 11 '13 at 05:19

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call add() method with a negative parameter if you want to subtract and positive parameter if you want to add the hour.

for adding 2 hours,

    calendar.add(Calendar.Hour,2);

for subtracting 3 hours,

    calendar.add(Calendar.Hour,-3);

answered Oct 11 '13 at 05:19

Kedar1442

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when there is already an answer please upvote the other answer if it answers the question instead of giving the same answer. – Thirumalai Parthasarathi Oct 11 '13 at 06:03

How to subtract an hour from current timestamp

5 Answers5