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Date transformations
From calendar date to julian day
day: 
month: 
year: 
hours: 
minutes: 
seconds: 
 
julian day: jdn
day of the week: day of the week
day of the year (daynumber): day of the year
easter date for the entered year: easter date
from julian day to calendar date
julian day: 
 
day with fraction day with fraction
day day
  hours hours minutes minutes seconds seconds
month month
year year
from daynumber and year to calendar date
daynumber: 
year: 
 
day: day
month: month
year: year
from gregorian (or julian) calendar to islamic calendar
day: 
month: 
year: 
 
equivalent julian day: jday
equivalent julian month: jmonth
equivalent julian year: jyear
day: day
month: month
A.H.: A.H.
from islamic calendar to gregorian (or julian) calendar
day: 
month: 
year: 
 
day: day
month: month
year: year
Determine Pesach (15 Nisan) in the gregorian (or julian) calendar
year: 
 
day: day
month: month
Jewish or Hebrew year: year
# months in this Jewish (Hebrew) year: numberofmonths
Add 163 days to know the beginning of the next Jewish year (1 Tishri)