[Haskell-cafe] Getting the number of seconds since epoch from System.Time.ClockTime

[Martin Percossi]

Hello haskell-cafe,

In System.Time,

data ClockTime = TOD Integer Integer

, where the first integer represents the number of seconds since epoch,
and the other represents the number of picoseconds. Is there a way of
retrieving the first part? (In Haskell 98, the ClockTime type is abstract).

TIA
Martin

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[Simon Marlow]

Martin Percossi wrote:
> Hello haskell-cafe,
>
> In System.Time,
>
> data ClockTime = TOD Integer Integer
>
> , where the first integer represents the number of seconds since epoch,
> and the other represents the number of picoseconds. Is there a way of
> retrieving the first part? (In Haskell 98, the ClockTime type is abstract).

Better to use the new time package, in particular Data.Time.Clock.POSIX:

http://www.haskell.org/ghc/docs/latest/html/libraries/time/Data-Time-Clock-POSIX.html

getPOSIXTime will do what you want.

Cheers,
Simon

[Rich Neswold]

On 4/26/07, Martin Percossi <haskel...@martinpercossi.com> wrote:
> In System.Time,
>
> data ClockTime = TOD Integer Integer
>
> , where the first integer represents the number of seconds since epoch,
> and the other represents the number of picoseconds. Is there a way of
> retrieving the first part? (In Haskell 98, the ClockTime type is
abstract).

I usually pattern match the constructor:

do { TOD epoch _ <- getClockTime
; putStrLn $ "epoch is " ++ show epoch }

--
Rich

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