Times prepopulating in Date/Time field on deal records

Times prepopulating in Date/Time field on deal records

Support tells me that there is no workaround to having the time auto-fill on a date/time field in our deal records -- that is HUGELY inconvenient and creates massive opportunity for error. Our deals involve several parts over various days/times, none of which are likely to be the random time that we began entering the deal. HELP!!!!

Also - how do others handle times that are TBD?