| julian_day {tagtools} | R Documentation |
Convert between dates and Julian day numbers.
Description
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 |
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.
Value
See the description section for details on the return.
Examples
julian_day(y = 2016, d = 12, m = 10)
julian_day(y = 2016, 286)