days_since_month: Calculate days from a given calendar month

In davidclarance/africabirdmap: Functions to clean, analyze and plot Africa Bird Map data.

Description

An a-historical method to calculate pentades by calculating distance from a given calendar month.

Usage

days_since_month(date, start_month = 7)

Arguments

date	A 'date' object. This can be a single date or a vector of dates.
start_month	An integer between 1 and 12 (inclusive) that indicates the month you want to measure distance in days from. Default is 7.

Details

This functions assumes that all years are 365 days. Necessary corrections for leap years are made.

Value

This function returns an integer between 1 and 365 indicating the number of days elapsed since the first of the month indicated in 'start_month'

Examples

# single date conversion example
days_since_month(date = as.Date('2018-09-14'), start_month = 7)

# multiple dates conversion examples
sequence_of_dates <- c(as.Date("2019-01-01"), as.Date("2019-03-19"))
days_since_month(date = sequence_of_dates, start_month = 6)

davidclarance/africabirdmap documentation built on Sept. 3, 2019, 12:34 p.m.