The Rata Die calculator compute the Rata Die (RD) when you input a Gregorian (standard modern calendar) date.
INSTRUCTIONS: Enter the following:
Rata Die (RD): The calculator returns the Rata Die as an integer.
The RD's first day is on January 1, 1
"The Rata Die is a system used in Rexx, Go and Microsoft .NET. It uses the local timezone, and day 1 is January 1, 1, that is, the first day of the Christian or Common Era in the proleptic Gregorian calendar."1
If you input January 1, 1, this equation will return the RD Day: 1.0