Dates are written as YYYY/MM/DD, or -YYYY/MM/DD for negative dates. This is a fairly recognisable international format for date notation, similar to the ISO8601 format for Gregorian dates (YYYY-MM-DD). It has the most significant units appearing first, which is convenient when comparing dates in computer programs.

Months can be specified as YYYY/MM, and anually recurring dates can be specified as MM/DD.

Single-digit days and months are therefore padded with a leading 0 to make 2 digits. Years are similarly padded to 4 digits (at least until the year 10,000, anyway), which is familiar, and distinguishes them from other parts of the date. The century is always shown, to avoid Y2K-type issues.

Separator character

The forward slash character '/' is used as the date separator, for several reasons:

The only real downside of this choice of separator is that if a date is written without the year or day, e.g. 12/25, then it could be interpreted as a fraction. But this should not happen very often.

Golden Era Notation

The date can optionally be followed by "GE" for "Golden Era", to further distinguish it from dates in Gregorian or other calendars. The full format specification for a date is therefore as follows: [-]YYYY/MM/DD[ GE]