sddstimeconvertdoes conversions between calendar time in terms of (for example) day, month, and year, and ``time-since-epoch''. The latter is the time in seconds since a system-defined reference time (e.g., 0:00 on January 1, 1970).
HourOfDayare the names of the columns in the input file and
Timeis the column to be created containing the time-since-epoch.
sddstimeconvertcontains the floating-point time-of-day in hours. That is, the minutes and seconds are folded into the hour value.
Year values must be the full four-digit year; e.g., year 99 is not 1999, but rather 99 AD.