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This function is used to convert between dates and Julian day numbers. There are three different input arrangements, each of which returns a different output. For a description of the different input arrangements, see below.

Usage

julian_day(y = NULL, m = NULL, d = NULL)

Arguments

y

A single year or vector of years

m

A single month or vector of months

d

A single day or vector of days

Value

See the description section for details on the return.

Details

Possible input combinations: (n <- julian_day()) returns the Julian day number for today. (n = julian_day(y,d)) where y is a single year or a vector of years and d is a single day number or a vector of daynumbers, returns the date vector [year,month,day] for each year, day pair. (n = julian_day(y,m,d)) where y is a single year or a vector of years, m is a single month or vector of months, and d is a single month day or a vector of month days, returns the Julian day number for each year, month, day.

Examples

julian_day(y = 2016, d = 12, m = 10)
#> [1] 286
julian_day(y = 2016, 286)
#> [1] "2016-10-12"