Anyways, in the document they say that there are some built in functions that to be honest I never tried. What I normally do, is to handle two fields (one for date and one for time, but I can put it together). Both are text, and since the time is only for information purposes for me I stored as: hh:mm:ss on a 24 hrs format. For the date I use YYYMMDD. In this way is easy to make comparisons to check if a date is greater than another.