Given an array of times, SEL_TIMRANGEwill return the subscripts of the
elements which fall between a set of input times. The /between
option should be used when you want all datasets between the start and
stop times, since the default is to return the first entry BEFORE the
start time (this was for historical reasons when accessing the FEM structures).
It is possible to
have a boolean array returned which is the same length as the input.
The array will have a 1 if the input time is in the time range
specified, and a 0 otherwise. This is useful for using with WHERE
commands.
IDL> ss = sel_timrange(roadmap, st_tim, en_tim)
IDL> ss = sel_timrange(orbit_arr, '1-jul-92', '22-jul-92', /between)
IDL> ok = sel_timrange(index, '23-jun-93', '24-jun-93', /boolean)