[Haskell-cafe] What is the good way to work with list comprehension and UTCTime?

[Magicloud Magiclouds]

This is nice. Thanks to all.

On Fri, Sep 14, 2012 at 4:03 PM, Roman Cheplyaka <roma at ro-che.info> wrote:
> Consider using the time-lens package.
>
>   import Data.Time.Lens
>   import Data.Lens.Common
>
> List comprehension style:
>
>   [modL seconds (+ fromIntegral n) t | n <- [0..]]
>   [modL minutes (+ n) t | n <- [0..]]
>
> (you need fromIntegral for seconds, because it is of fractional type in
> Data.Time).
>
> iterate style, as suggested by Karl:
>
>   iterate (seconds ^+= 1) t
>   iterate (minutes ^+= 1) t
>
> On Fri, Sep 14, 2012 at 7:29 AM, Magicloud Magiclouds
> <magicloud.magiclouds at gmail.com> wrote:
>>
>> Hi,
>>   Simple usage, I could make an instance of Enum to UTCTime, so
>> [utcTime..] could work. But that is so stiff. How if sometimes I want
>> to step by 1 min, sometimes I want to step by 1 sec?
>>   So I think some way like [ t | addUTCTime last 60 ] could be nice.
>> But I cannot figure it out....
>>   Any idea?
>> --
>> 竹密岂妨流水过
>> 山高哪阻野云飞
>>
>> And for G+, please use magiclouds#gmail.com.
>>
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>
>



-- 
竹密岂妨流水过
山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.