There are three equally valid ways of specifying the start time of
2007:07:04::12:00:00 for a given BLUE file (substitute
YStart for XStart with a Type 2000 file):
Start time given in TimeCode field:
TimeCode = 2007:07:04::12:00:00
XStart = 0
Start time given in XStart field:
TimeCode = 0
XStart = 2007:07:04::12:00:00
Start time given as TimeCode + XStart:
TimeCode = 2007:07:04::00:00:00
XStart = 12:00:00
or
TimeCode = 2007:07:04::08:30:00
XStart = 12600
The first of these is rather common among Midas users. The
TimeCode is set to the start-of-day. The
XStart is then set to the number of seconds
since the start-of-day.
Non-Linear Time Code:
Various options are available in the Midas
frameworks to handle data with non-linear Time Code. The handling of
non-linear time is an advanced topic and is not included as part of
this training.