Compute days between two dates in Java

Question

I have a code that has 2 dates in the format

DateFormat dateFormat= new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");
           Date date=new Date();

           DateFormat formatter ; 
           Date publishDate = (Date)dateFormat.parse(pubDate);

I want to calculate days between two dates. I can't use Joda package. Is there any way to get the day difference in the 2 dates ?

Check answers here : stackoverflow.com/questions/3299972/… . The 4th is what you may need — StepTNT
– StepTNT, Commented May 18, 2012 at 17:31

ControlAltDel · Accepted Answer · 2012-05-18 17:31:30Z

4


Date d1 = ..., d2 = ...;
long t1 = d1.getTime(),
   t2 = d2.getTime();
long day = 1000 * 60 * 60 * 24; // milliseconds in a day
return (t1 - t2) / day;

answered May 18, 2012 at 17:31

ControlAltDel

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2 Comments

user177800 Over a year ago

You need to normalize the Date objects millis by making them equal to the same point in the day; ex: 12AM for this approach to be 100% accurate.

ControlAltDel Over a year ago

it depends what the specifications are. But sure

Jeff Storey · Accepted Answer · 2012-05-18 17:31:41Z

1

You can just subtract the millis between the 2 dates and then divide by number of millis per day

answered May 18, 2012 at 17:31

Jeff Storey

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3 Comments

user177800 Over a year ago

You need to normalize the Date objects millis by making them equal to the same point in the day; ex: 12AM for this approach to be 100% accurate.

Tony Ennis Over a year ago

And Daylight Wastings Time can affect the result too.

Jeff Storey Over a year ago

Yes, I was just giving a general idea of how to do it. There are definite issues with daylight savings times and other time oddities which make time difficult to deal with. My original thought would have been to just use JODA, but the OP said they cannot use it.

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