Time library discussion (reprise)

Peter Simons simons at cryp.to
Tue Nov 11 23:05:30 EST 2003

Simon Marlow writes:

 > Presumably, without TAI support, the library will be
 > unable to do accurate calendar calculations at the second
 > level [...]

As I understand it, calendar time calculations into the
future are _always_ inaccurate, because UTC is not
continuous. Either you'll get an incorrect "duration" or
you'll get an incorrect "point in time". It can't be helped.

The C++ time library of the Boost effort has a very
interesting discussion of this topic, available here:


Pardon me, if this has been brought up already.

As for implementing a time library in Haskell, we might be
able to base the effort on one of the existing API designs
-- or even one of the existing implementations? There are,
among others:

 - The Boost.Time library mentioned above.

 - A proposed API extension for the ISO C 200X standard:

 - Proposed ISO C 200X Calendar Library Functions:

 - Dan Berstein's libtai: http://cr.yp.to/libtai.html

Surely there is _something_ out there that can be re-used?


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