Functions:-Contains date and time related constants that will require patching over time. Notes based on Tue Apr 6 10:17:55 2010 -0400 LEAP_SECONDS Offset between GPS and UTC, in seconds. START_SUBFRAME When to start doing subframe queries to get the leap-second offset. Should be set to the next possible time for a leap-second change according to IERS. CENTURY_BASE Currently 2000