julday {clim.pact} | R Documentation

## Converts from month, day, and year to Julian days

### Description

The function computes Julian days from month, day, and year. The code is based on the algortithm from Press et al. (1989), "Numerical Recipes in Pascal", Cambridge, p. 10. See also `chron` and `date` for similar functions. This function was included to avoid the dependency to the `chron` and `date` packages. See also `caldat`.

### Usage

    julday(mm,id,iyyy)

### Arguments

`mm` | month.
`id` | day.
`iyyy` | year.

### Value

real

### Author(s)

R.E. Benestad

### Examples

    julday(1,1,1)                       # 1721424
    julday(1,1,1970)                    # 2440588
    julday(9,4,2003)                    # 2452887
    julday(9,4,2003)-julday(1,1,1970)   # 12299
    julday(9,4,2003)-julday(1,1,2003)   # 246
    julday(1,1,2003)-julday(1,1,2002)   # 365
    julday(1,1,2001)-julday(1,1,2000)   # 366

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