id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
281	Leap Seconds	Dave Offiler	Dave Offiler	"The ''!TimeSince()'' routine in ''ROPP_UTILS/datetime/datetime.f90'' supports converting calendar date/times to elapsed time in seconds since the GPS epoch (00:00:00 6-Jan-1980) or vice-versa. This option is used within the ROPP_PP module.

Stig points out that ''!TimeSince()'' does not take into account any accumulated leap seconds which have been applied to UTC since the GPS epoch; there is currently a 15s difference between UTC and GPS times (an offset value contained within the GPS broadcast message).

While Stig believes that the ROPP_PP application has no obvious error caused by neglecting leap seconds, the routine ought to correctly account for them.

It would also be useful to have the functionality to convert GTS times which are given in terms of Week Number since epoch (modulo 1024) and seconds into the week, to UTC calendar date/time (and vice-versa).

References:
   * http://en.wikipedia.org/wiki/Leap_second
   * http://en.wikipedia.org/wiki/Global_Positioning_System#time_format
"	enhancement	closed	normal	9.1	ropp_utils	6.0	fixed	Date and time, timesince, GPS epoch, GPS week number