2015.0.1 (2015-05)

• Fix documentation to reflect addition of 2015 leap second.
• Hide hypothetical leap seconds (prior to 1972-01-01).
• Add test suite to .cabal.

2015 (2015-01)

• Added 2015 leap second (2015-06-30T23:59:60Z).

2012 (2012-01)

• Added 2012 leap second (2012-06-30T23:59:60Z).

2009 (2009-01)

Initial release including all leap seconds up to 2009-01-01.