The leapseconds-announced package

[Tags:bsd3, library]

Provides an easy to use static Data.Time.Clock.TAI.LeapSecondTable with the leap seconds announced at library release time.

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Versions 2009, 2012, 2015, 2015.0.0.1
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Dependencies base (<10), time (<2) [details]
License BSD3
Copyright Bjorn Buckwalter 2009-2015
Author Bjorn Buckwalter
Stability Stable
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Source repository head: git clone
Uploaded Mon May 18 12:39:26 UTC 2015 by BjornBuckwalter
Distributions NixOS:2015.0.0.1
Downloads 613 total (5 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2015-05-20 [all 1 reports]




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Readme for leapseconds-announced

Readme for leapseconds-announced-2015.0.0.1


This libraray provides a static Data.Time.Clock.TAI.LeapSecondTable "containing" the leap seconds announced at library release time. A new version of the library is released every time the International Earth Rotation and Reference Systems Service (IERS) announces a new leap second at

This module is intended to provide a quick-and-dirty leap second solution for one-off analyses concerned only with the past and present (i.e. up until the next as of yet unannounced leap second), or for applications which can afford to be recompiled against an updated library as often as every six months.


Import Data.Time.Clock.AnnouncedLeapSeconds to bring the leap second table lst into scope. Here is a usage example:

import Data.Time
import Data.Time.Clock.TAI
import Data.Time.Clock.AnnouncedLeapSeconds

-- | Convert from UTC to TAI.
utcToTAITime' = utcToTAITime lst
-- | Convert from TAI to UTC.
taiToUTCTime' = taiToUTCTime lst

-- | Add a length of time to a UTC time, respecting leap seconds
--   (as opposed to Data.Time.Clock.addUTCTime).
addUTCTime' :: DiffTime -> UTCTime -> UTCTime
addUTCTime' dt = taiToUTCTime' . addAbsoluteTime dt . utcToTAITime'