jdn2tind

<code>jdn</code> computes the JDNs for dates or date-time indices and
<code>jdn2tind</code> returns dates or date-time indices given JDNs.
For date arguments <code>jdn</code> returns the numbers of days
since November 24, 4714 BC in the proleptic Gregorian calendar as
an integer vector. For date-time arguments day fraction in UTC is computed
and the return value is a numeric vector.
For integer arguments <code>jdn2tind</code> return <code>tind</code> of type
<code>"d"</code> (date), for non-integer arguments --- <code>tind</code> of type
<code>"t"</code> (date-time). If <code>tz</code> argument is provided the return value
is always of type <code>"t"</code> (date-time).

Provides an easy-to-use tind class representing time indices
of different types (years, quarters, months, ISO 8601 weeks, dates,
time of day, date-time, and arbitrary integer/numeric indices).
Includes an extensive collection of functions for calendrical computations
(including business applications), index conversions, index parsing,
and other operations. Auxiliary classes representing time differences and
time intervals (with set operations and index matching functionality) are
also provided. All routines have been optimised for speed in order
to facilitate computations on large datasets. More details regarding
calendars in general and calendrical algorithms can be found in
"Calendar FAQ" by Claus Tøndering <https://www.tondering.dk/claus/calendar.html>.

Grzegorz Klima

tind

A Common Representation of Time Indices of Different Types

jdn function

<dl><dt>x</dt>
<dd>an object of <code>tind</code> class or an R object coercible to it
for <code>jdn</code>, an integer or numeric vector for <code>jdn2tind</code>.</dd>
<dt>tz</dt>
<dd>(optional) a character value determining the time zone (the default
<code>NULL</code> is interpreted as the system time zone).
See <code>tzone</code> documentation for information on time zones.</dd></dl>

Arguments

Date and Date-Time Conversion to and from Julian Day Number (JDN) — jdn

<dl>

<dt>x</dt>
<dd>an object of <code>tind</code> class or an R object coercible to it
for <code>jdn</code>, an integer or numeric vector for <code>jdn2tind</code>.</dd>


<dt>tz</dt>
<dd>(optional) a character value determining the time zone (the default
<code>NULL</code> is interpreted as the system time zone).
See <code>tzone</code> documentation for information on time zones.</dd>

</dl>

jdn: Date and Date-Time Conversion to and from Julian Day Number (JDN)

Description

Usage

Value

Arguments

See Also

Examples