[erlang-questions] add a time interval to a timestamp

Harsh J <>
Tue Mar 15 17:09:43 CET 2011


Indeed, it is catchable - as Robert has demonstrated.

On Tue, Mar 15, 2011 at 8:23 PM, Ralf P. Gans <> wrote:
> Hi,
>
> I'm very new to erlang, but isn't the exception the validation?
> Isn't the exception catchable?
>
> It's what I would do in C++ or Java.
>
> Or am I thinking the wrong way?
>
> Cheers, Ralf
>
> On 15.03.2011, at 15:32, Attila Rajmund Nohl wrote:
>
>> Hello!
>>
>> Unfortunately the calendar:* functions crash on wrong input:
>>
>> 1> calendar:datetime_to_gregorian_seconds({{2011,2,30},{1,2,3}}).
>> ** exception error: no true branch found when evaluating an if expression
>>     in function  calendar:date_to_gregorian_days/3
>>     in call from calendar:datetime_to_gregorian_seconds/1
>>
>> So if the input cannot be trusted, there's still some validation to be done.
>>
>> 2011/3/15, Harsh J <>:
>>> Hello,
>>>
>>> How about handling this with seconds since year 0?
>>> calendary:datetime_to_gregorian_seconds to get seconds, adding up this
>>> integer in seconds as you need and converting back to datetime with
>>> calendary:gregorian_seconds_to_datetime.
>>>
>>> On Tue, Mar 15, 2011 at 4:24 PM, Loris Fichera <>
>>> wrote:
>>>> Hello everybody,
>>>>
>>>> Say I want to write a function that takes as input a timestamp (in the
>>>> form {{y,m,d}, {h,m,s}} ) and returns another timestamp, obtained by
>>>> adding a certain amount of {hours, minutes, seconds} to the input.
>>>
>>> --
>>> Harsh J
>>> http://harshj.com
>>>
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>>
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>
>
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-- 
Harsh J
http://harshj.com


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