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Helper functions for manipulation of dates, includding conversion between (day of year) (DOY) to date and back, and extraction of parts of a date.
dateFromDoy(doy, year) doyFromDate(date) dayFromDate(date) monthFromDate(date) yearFromDate(date) isLeapYear(year) daysInYear(year)
integer or Date
integer. Day of the year (1..365) or (1..366) for leap years
integer. Year, e.g. 1982
Date object or character formatted 'yyyy-mm-dd', e.g. '1982-11-23'
doy <- 88 year <- 1970 date <- dateFromDoy(doy, year) date dateFromDoy(-15, 2000) doyFromDate(date) isLeapYear(2000) daysInYear(2000) daysInYear(1999)
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