v1.1 [Sep 16, 2013]
* Upgraded evaluation engine to provide more accurate results more of the time
* Error messages are now more informative
* Variables that you have defined are now shown on list on side
* British spellings for metre, litre, etc are now valid
* Can now take units to integral powers- eg, m^2 for square meters
* Trig functions now accept inputs in either radians, degrees, or dimensionless inputs
* New units: thou, chain, league, fathom,cable, nautical mile, link, rod, chain, kilopond, pound-force, poundal, horsepower, townships, sections, kips, molarity, molality- in total, over 230 new units, abbreviations and spellings
* Volume units for US and imperial systems are now fixed
* Units are now displayed with correct plurality
* Many bug fixes
Give it two dates and/or times, and it tells you the length of time between them
