Re: Date manipulations in Freemarker Templates

Friday, October 26, 2012, 2:18:19 PM, Daniel Dekany wrote:

> Thursday, October 25, 2012, 10:44:01 PM, Navin wrote:
>
>> Hi,
>>   Is there a way to manipulates dates in freemarker template.
>>
>> I want to add some days/month/year in the current date and want to compare
>> it with
>> another date. Is there any way to do this?
>
> Sorry, there's no built-in way.

It just comes to my mind... For a while FreeMarker can convert dates
to longs, and longs back to dates. So you can do some math when it's
in long form.

The relevant built-ins are someDate?long and someLong?number_to_date,
?number_to_datetime, ?number_to_time.

> (Actually, you could do some tricks
> with converting a date to string, increase the day in the string, then
> converting it back to a date, because FM supports these conversions...
> But it's lame and you had to know how many day a month has.) You will
> have write some TemplateMethodModelEx implementations that get a Date
> as parameter, do the calendar-math, then return the new Date. Let's
> say you write com.example.AddToDateMethodModelEx, then pull it into an
> FTL library with
> `<#assign addToDate = 'com.example.AddToDateMethodModelEx'?new()>`,
> then in the templates you can #import that library like
> `<#import '/lib/dateUtils.ftl.' as du>` so you can do
> `du.addToDate(someDate, 1)` and such.
>
>> -Navin
>

-- 
Best regards,
 Daniel Dekany


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