as.difftime

Expand difftime units to include months and years .

Keep track of dates in terms of fractional calendar months
per Damien Laker "Time Calculations for Annualizing Returns: the Need for Standardization",
The Journal of Performance Measurement, 2008.
Model dates as of close of business.
Perform date arithmetic in units of "months" and "years".
Allow "infinite" dates to model "ultimate" time.

Dan Murphy

mondate

Keep Track of Dates in Terms of Months

as.difftime function

<dl><dt>tim</dt>
<dd>character string or numeric value specifying a time interval.</dd><dt>format</dt>
<dd>character specifying the format of tim: see <a href="/link/strptime?package=mondate&version=1.0" data-mini-rdoc="mondate::strptime">strptime</a>.
 The default is a locale-specific time format.</dd><dt>units</dt>
<dd>Anything allowed by <a href="/link/as.difftime?package=mondate&version=1.0" data-mini-rdoc="mondate::as.difftime">as.difftime</a>.
 In addition, can be "months" or "years" in which case 
 <code>tim</code> must be numeric.</dd></dl>

Arguments

Author

Difftime with units Months and Years — as.difftime

<dl>

<dt>tim</dt>
<dd>character string or numeric value specifying a time interval.</dd>

<dt>format</dt>
<dd>character specifying the format of tim: see <a href='https://rdrr.io/r/base/strptime.html'>strptime</a>.
 The default is a locale-specific time format.</dd>

<dt>units</dt>
<dd>Anything allowed by <a href='https://rdrr.io/r/base/difftime.html'>as.difftime</a>.
 In addition, can be "months" or "years" in which case 
 <code>tim</code> must be numeric.</dd>

</dl>

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as.difftime: Difftime with units Months and Years

Description

Usage

Value

Arguments

Author

Details

See Also

Examples