A new package ConvCalendars is on CRAN, in response to requests earlier this week.
It performs conversions between the Gregorian calendar and other calendars including the Persian (Jalali) calendar used in Iran and Afghanistan and the Hebrew calendar used in Israel.
All the heavy lifting is done by C code from http://www.projectpluto.com.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
tlumley at u.washington.edu University of Washington, Seattle
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