round.POSIXt              package:base              R Documentation

Round / Truncate Data-Time Objects

Description:

     Round or truncate date-time objects.

Usage:

     ## S3 method for class 'POSIXt':
     round(x, units=c("secs", "mins", "hours", "days"))
     ## S3 method for class 'POSIXt':
     trunc(x, units=c("secs", "mins", "hours", "days"))

     ## S3 method for class 'Date':
     round(x, ...)
     ## S3 method for class 'Date':
     trunc(x)

Arguments:

       x: an object inheriting from '"POSIXt"' or '"Date"'.

   units: one of the units listed.  Can be abbreviated.

     ...: arguments to be passed to or from other methods, notably
          'digits'.

Details:

     The time is rounded or truncated to the second, minute, hour or
     day. Timezones are only relevant to days, when midnight in the
     current timezone is used.

     The methods for class '"Date"' are of little use except to remove
     fractional days.

Value:

     An object of class '"POSIXlt"'.

See Also:

     'round' for the generic function and default methods.

     'DateTimeClasses', 'Date'

Examples:

     round(.leap.seconds + 1000, "hour")
     trunc(Sys.time(), "day")

