2009/7/16 Valentino Lun <[email protected]>:
>
> Dear all
>
> Is there any existing function in rails to calculate time? I have google
> it but no information found..
>
> For example
> a = "2009-07-16 12:34".to_time
> b = "2009-07-16 12:04".to_time
> some_method(a,b) return "30 mins ago"
>
> c = "2009-07-16 12:34".to_time
> d = "2009-07-12 09:09".to_time
> some_method(c,d) return "4 days ago"
>
> If not, I will write it by my own. But it can save my time if there is
> existing method to do so...
>

Have a look at the documentation for the Time class.  You can just
subtract the times.
>> a = "2009-07-16 12:34".to_time
=> Thu Jul 16 12:34:00 UTC 2009
>>  b = "2009-07-16 12:04".to_time
=> Thu Jul 16 12:04:00 UTC 2009
>> diff = a-b
=> 1800.0 # 30 mins in seconds

Colin

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