dectime: Decimal Time

In leppott/baytrends: Long Term Water Quality Trend Analysis

Decimal Time

Description

Convert date/time data to be expressed as year and fractional part of year. This can be useful for plotting or representing time in a regression model.

Usage

dectime(
  dates,
  times,
  time.format,
  date.format,
  Date.noon = TRUE,
  year.type = c("calendar", "water", "climate")
)

Arguments

dates	a vector of a valid date object, or character representation of dates. Missing values are permitted and produce corresponding missing values in the output.
times	a character representation of times. Missing values are permitted and produce corresponding missing values in the output.
time.format	format to convert times. See Details.
date.format	format to convert dates is character.
Date.noon	logical, if TRUE and dates is class "Date," then set set the time to noon, otherwise no time adjustment is made. See Details.
year.type	a character string indicating the type of year to determine the offset, must be one of "calendar," "water," or "climate."

Details

The format for times must be one of "hm," "hms," or "ms." Note that this is actually a conversion function, see See Also. If times is missing, dates is class "Date," and Date.noon is TRUE, then set the time to 12:00, so that the decimal time represents the center of the day.

Added from smwrBase.

Value

A vector representation of the data in decimal format–year and decimal fraction.

Examples

dectime("11/11/1918", date.format="%m/%d/%Y")
dectime(1988:1990)

leppott/baytrends documentation built on Nov. 2, 2024, 6:42 p.m.