Home/ Questions/Q 8189025
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-07T03:06:34+00:00

I’m looking for a Haskell function which yield a value which slowly changes as

  • 0

I’m looking for a Haskell function which yield a value which slowly changes as wall-time elapses (and possibly wraps around after a while). I don’t really mind whether it’s IO Integer or IO Double or what. I just want a value that slowly changes as wall-time elapses.

Presumably there is an answer buried somewhere in the depths of the time package. (Or maybe old-time, but I presume that’s deprecated?) However, the time package seems really, really complicated. And I don’t actually care about timezones or human-readable time representations or anything. I just want a number that changes as wall-time elapses.

Can anybody show me a simple code snippet to do that? (Without me spending three days trying to figure out the complexities of the time package…)

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    From the Real World Haskell book:

    Prelude> import System.Time
Prelude System.Time> getClockTime
Loading package old-locale-1.0.0.2 ... linking ... done.
Loading package old-time-1.0.0.6 ... linking ... done.
Thu Jul  5 20:04:22 BST 2012
Prelude System.Time> getClockTime >>= (\(TOD sec _) -> return sec)
1341515116
Prelude System.Time> getClockTime >>= (\(TOD sec _) -> return sec)
1341515118
Prelude System.Time> getClockTime >>= (\(TOD sec _) -> return sec)
1341515121
    • 0