Re: Ethiopian calendar year(DATE TYPE) are different from theGregorian calendar year

In Ethiopia the year have 13 months and but in Gregorian calendar the year have 12 months,

The Ethiopian society's are want to use his Ethiopian calendar year,i have the algorithm,

but the way i add to the postgresql source code as EXTENSION? or to the backend(to kernel)? 

13th month have 5 days and in fourth year 13th month have 6 days.that means 1 year have 365.25 days,my algorithm converts  Gregorian calendar year to Ethiopian calendar year.