cdatecalc is a C99 library for manipulating dates and times. At present it
supports date calculations in TAI, UTC, UTC with arbitrary offsets and BST
(British Summer Time).

Operations supported include translation between time zones, discovering the
number of seconds between two calendar times and adding or subtracting discrete
units (seconds, months, days, ..) from a calendar time to form another calendar
time.

cdatecalc resides in a single (rather large) compilation unit for easy linking
with your own programs and comes with a set of unit tests you can use to check
that it more or less does what it's supposed to.

Please contribute and make datecalc better! In particular, we don't currently
support the Gregorian/Julian transition.

datecalc was developed with funding from the UK Metropolitan Police, who also
hold the copyright in the initial version. It is licenced under the MPL 1.1.

Please ignore any previous licences in source control; they are an artefact of
an import from the original git repository.