CODEWITHSUNDEEP
javadate
hellzone
hellzone

Reputation: 5246

How to calculate 1 month ago in milliseconds?

I want to calculate 1 month ago from current time in milliseconds. For example if date is 25.11.2016 then I want to get 25.10.2016 as milliseconds format. How can I calculate this date as milliseconds? Below code is not working properly I think.

System.currentTimeMillis() - 1000*60*60*24*30

Upvotes: 2

Views: 10036

Answers (5)

rkosegi
rkosegi

Reputation: 14678

You can use this way:

Calendar c = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
c.add(Calendar.MONTH, -1);
long result = c.getTimeInMillis();

Note that System.currentTimeMillis() is using UTC, so you need to create an instance of Calendar using the same TimeZone.

Upvotes: 7

Fildor
Fildor

Reputation: 16158

With Java 8 you can do:

// Get the actual date time and subtract one month
LocalDateTime ldt = LocalDateTime.now().minusMonths(1);

// LocalDateTime cannot be directly converted to millis. It has no notion of  a TimeZone, so:
ZonedDateTime zdt = ldt.atZone(ZoneId.of("America/Los_Angeles")); // Just insert the correct zone

// Now you can get the Millis:
System.out.println(zdt.toInstant().toEpochMilli());

Thanks to commenter @BasilBourque:

For Java 6 & 7, ThreeTen-Backport. Further adapted for Android in ThreeTenABP. Absolutely worth the bother of adding to you project and learning.

Upvotes: 3

Ugur Tufekci
Ugur Tufekci

Reputation: 350

Try this:

try {
        SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy");
        Date past = format.parse("01/10/2010");
        Date now = new Date();

        System.out.println(TimeUnit.MILLISECONDS.toMillis(now.getTime() - past.getTime()) + " milliseconds ago");
        System.out.println(TimeUnit.MILLISECONDS.toMinutes(now.getTime() - past.getTime()) + " minutes ago");
        System.out.println(TimeUnit.MILLISECONDS.toHours(now.getTime() - past.getTime()) + " hours ago");
        System.out.println(TimeUnit.MILLISECONDS.toDays(now.getTime() - past.getTime()) + " days ago");
} catch (Exception j) {
        j.printStackTrace();
}

Upvotes: -1

cosmin.danisor
cosmin.danisor

Reputation: 963

I think this is what you need.

Calendar aMonthAgo = Calendar.getInstance();
aMonthAgo.add(Calendar.MONTH, -1);
long aMonthAgoInMS = aMonthAgo.getTime().getTime();

Upvotes: 2

Angelo Immediata
Angelo Immediata

Reputation: 6954

You can do in this way:

        Date d = new Date();
        Calendar c = new GregorianCalendar();
        c.setTime(d);
        c.add(Calendar.MONTH, -1);
        Date dOneMonthAgo = c.getTime();
        System.out.println("D: "+d+" dOneMonthAgo: "+dOneMonthAgo);
        long todayMillis = d.getTime();
        long oneMonthAgoMillis = dOneMonthAgo.getTime();

I hope this helps Angelo

Upvotes: 5

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