Date Hour String

All date/hour strings are [{+|-}]YYYY-MM-DD HH:MM:SS.ss [{JD|GD}]

JD: Julian date (Old Style)
GD: Gregorian date (New style)

Minus year convention is astronomical convention
So 0 is 1 B.C
-1 is 2 B.C and so on

For example -1-12-31 23:59:50 JD is December 31 2 BC at 23h59'50" (Julian Date)

Remark: changed from previous version of Proastro, documentation may contain errors.