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\title{Create a period object.}
\item{...}{a list of time units to be included in the
period and their amounts. Seconds, minutes, hours, days,
weeks, months, and years are supported.}
a period object
new_period creates a period object with the specified
values. Within a Period object, time units do not have a
fixed length (except for seconds) until they are added to
a date-time. The length of each time unit will depend on
the date-time to which it is added. For example, a year
that begins on 2009-01-01 will be 365 days long. A year
that begins on 2012-01-01 will be 366 days long. When
math is performed with a period object, each unit is
applied separately. How the length of a period is
distributed among its units is non-trivial. For example,
when leap seconds occur 1 minute is longer than 60
Periods track the change in the "clock time" between two
date-times. They are measured in common time related
units: years, months, days, hours, minutes, and seconds.
Each unit except for seconds must be expressed in integer
Period objects can be easily created with the helper
functions \code{\link{years}}, \code{\link{months}},
\code{\link{weeks}}, \code{\link{days}},
\code{\link{minutes}}, \code{\link{seconds}}. These
objects can be added to and subtracted to date-times to
create a user interface similar to object oriented
new_period is meant to be used interactively on the
command line. See \code{\link{period}}, for a version
that is better suited to automating within a function.
new_period (second = 90, minute = 5)
# "5M 90S"
new_period(day = -1)
# "-1d 0H 0M 0S"
new_period(second = 3, minute = 1, hour = 2, day = 13, week = 1)
# "20d 2H 1M 3S"
new_period(hour = 1, minute = -60)
# "1H -60M 0S"
new_period(second = 0)
# "0S"
\code{\link{period}}, \code{\link{as.period}}
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