How to combine sql.Date with sql.Time into one?

I have a database where I keep dates and times separately, and getting date only and time only out of a java.util.Date is no problem thanks to the classes java.sql.Date and java.sql.Time. However, I need to read these values back in, put them back together, and then do date comparisons with java.util.GregorianCalendar. I tried just adding the millisecond long values together but that didn't seem to work, and I've tried setting the year, month, date, hours, minutes and seconds individually into a GregorianCalendar but I haven't figured that out yet. Certain queries work out better keeping the date and time separate in the database and it takes less bytes than a timestamp, so please don't suggest I use a timestamp!
Thanks for your help!
Stephen

You can add the milliseconds (ms), but you need to use just part of it. For this example, let X be one more than the maximum number of units in time and also the minimum number of units in date. If we were using hours instead of ms X would be 24.
t = total ms from time
d = total ms from date
T = new combined time
T = ((d / X) * X) + (T % X);Add (the date, rounded to the nearest day) and (the portion of time which is less than a day).

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