Custom Start & End Times
From the Custom Start & End Times menu (Admin Control Panel -> Settings -> Listing Settings -> Global Settings -> Custom Start & End Times):
Enable Custom Start Time
If checked, enables the custom start time option for listings.
Enable Custom End Time
If checked, enables the custom end time option for listings.
Note: If not enabled, only the listing duration selector will be available.
From the Create Listing (Listing Settings section) menu, select:
Custom Start Time
and