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Edit File: timespan.html

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<table width="100%" summary="page for timespan {lubridate}"><tr><td>timespan {lubridate}</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Description of time span classes in lubridate</h2>

<h3>Description</h3>

<p>A time span can be measured in three ways: as a duration, an interval, or a
period.
</p>

<ul>
<li> <p><a href="duration.html">duration</a>s record the exact number of seconds in a time span.
They measure the exact passage of time but do not always align with
human measurements like hours, months and years.
</p>
</li>
<li> <p><a href="period.html">period</a>s record the change in the clock time between two date-times.
They are measured in human units: years, months, days, hours, minutes,
and seconds.
</p>
</li>
<li> <p><a href="Interval-class.html">intervals</a> are time spans bound by two real date-times. Intervals can be
accurately converted to periods and durations.
</p>
</li></ul>

<h3>Examples</h3>

<pre>
duration(3690, "seconds")
period(3690, "seconds")
period(second = 30, minute = 1, hour = 1)
interval(ymd_hms("2009-08-09 13:01:30"), ymd_hms("2009-08-09 12:00:00"))

date &lt;- ymd_hms("2009-03-08 01:59:59") # DST boundary
date + days(1)
date + ddays(1)

date2 &lt;- ymd_hms("2000-02-29 12:00:00")
date2 + years(1)
# self corrects to next real day

date3 &lt;- ymd_hms("2009-01-31 01:00:00")
date3 + c(0:11) * months(1)

span &lt;- date2 %--% date  #creates interval

date &lt;- ymd_hms("2009-01-01 00:00:00")
date + years(1)
date - days(3) + hours(6)
date + 3 * seconds(10)

months(6) + days(1)
</pre>

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