Freemarker date arithmetic

[rhofkens]

Hello,

I'm building a Freemarker Template that shows a grouped view of  the documents in a space:

- all docs changed today
- all docs changed yesterday
- all docs changed last week
- all docs changed last month

This would be easy enough to do using lucene queries with varying [date1] TO [date2] parts in the query.  Unfortunately, Freemarker doesn't seem to support date arithmetics, such as current_date - 1day and so on.

I don't like the idea of calculating the dates myself. Does anybody know of an easy way to do this in Freemarker?

Best regards,

[kevinr]

We have provided some custom methods to work on dates in FreeMarker - such as date compare and date increment:

 * Usage: 
 *    dateCompare(dateA, dateB) - returns 1 if dateA if greater than dateB
 *    dateCompare(dateA, dateB, millis) - returns 1 if dateA is greater than dateB by at least millis, else 0 
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(from the javadoc)

incrementDate(date, increment) - returns new date incremented by 'increment' milliseconds
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Hope this helps,

Kevin

[rhofkens]

Hi Kevin,

great, the incrementDate function looks like the one I need.  I'll try out if this also works with a negative increment (effectively creating a decrementDate function).  If not, I'll implement decrementDate myself based on your code.

Cheers,
Roeland.

[kevinr]

The code looks like it simply converts the date to a long value, adds the increment long number value to the date (which can be a negative) and converts the resulting long back to a Date so it should work ok.

Thanks,

Kevin