Comment 47 for bug 365065

It occurred to me today while writing a date-sensitive test function that we could solve most of the date problems by using GDates for most everything (GDateTimes might be appropriate for price quotes) and storing the GDate Julian value instead of a timespec. (The GDate Julian value is the number of days since 1 Jan 1, computed as if the Gregorian calendar had been in use since then.)