Returns the number of seconds from a time string.
A string. The time in hh:mm:ss format.
An integer, the total number of seconds represented by the time string.
A value of 0 seconds represents midnight. Since the total number of seconds in a day is 86400, todstr("12:00:00") is 43200 or noon.
Use TODMSECSTR to handle milliseconds.
Use STRTOD to convert seconds into a time string.