Various approaches for this I suspect but you could try adding the time as a decimal or fraction of a day. For this you need to use the entire data and time values as a single Date and Time field - and the version of Monarch that you have may be a bit of a problem if it is rather old. If you can define a field with Date and Time field propertieds you should be OK.
For hours and minutes make the calculation for decimal or fractional minutes in a day. Etc.
There are probably more full proof ways but this may do for you purpose.