Catalog Item - No Time Only Variable

I'm working on creating a new Catalog Item for requesting a scheduled report.  As part of this I need a way for the requester to enter what time of day they want the report to run, but there is not a variable for Time only.  There is Date and Date/Time.  I did some digging and it looks like people are using Select Box variables and populating them with options for every 30 minutes throughout the day, but I'm looking for someone that allows them to enter a specific time down to the minute.

Does anyone have some suggestions on how I can get this done?