How to produce a local datetime string in Haskell?

Question

I want to produce the local time and date in string form, such as, for example:

"2009-09-28-00-44-36.896200000000"

Answer 1

Unless I'm missing what your really after, what you want is:

import Data.Time
getCurrentTime

when run in GHCi, you get:

2009年09月28日 01:18:27.229165 UTC

or, for local time (as you indicated and I just caught):

getZonedTime

to get:

2009年09月27日 20:22:06.715505 CDT

Answer 2

While getCurrentTime and getZonedTime do return the current time and local time respectively, these may not be what liszt is expecting. He wants a string that represents the present time, while both getCurrentTime and getZonedTime returns IO UTCTime and IO ZonedTime respectively

This could do what liszt is looking for:

import Data.Time
currentTime = fmap show getCurrentTime
zonedTime = fmap show getZonedTime

Cheers

Answer 3

import System.Time
main = do ct <- getClockTime
 print ct

or

import Data.Time
main = do zt <- getZonedTime
 print zt

• Mikhail: Why not main = print =<< getClockTime?