HELPER_splitDayHourMinuteString

Description: Splits a combined numeric day and hour/minute string into day and hour/minute.
Parameter:

• in: Combined numeric day and hour/minute string
• day: The day variable to write the day number to.
• hour: The hour variable to write the hour number to.
• minute: The minute variable to write the minute number to.

Returns:

• true, if the input string is long enough.