changing the type of start leads to overwrite the period end

If you change the kind of start time (single start, interval end/start, interval start/start) the hours of the period end will be overwrite with "24".

To reproduce:

• create a job
• select run_time|Every Day
• type in a period (e.g. 10:00:00 to 15:30:00)
• change the kind of start to "interval start/start"

the period end will change to 24:30:00