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

This is nice. Thanks to all. On Fri, Sep 14, 2012 at 4:03 PM, Roman Cheplyaka 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 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

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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.