trunc.POSIXt {Hmisc} | R Documentation |
truncPOSIXt
returns the date truncated to the specified unit.
ceil.POSIXt
returns next ceiling of the date at the unit selected in
units
.
roundPOSIXt
returns the date or time value rounded to nearest
specified unit selected in digits
.
truncPOSIXt
and roundPOSIXt
have been extended from
the base
package functions trunc.POSIXt
and
round.POSIXt
which in the future will add the other time units
we need.
ceil(x, units,...) ## Default S3 method: ceil(x, units, ...) truncPOSIXt(x, units = c("secs", "mins", "hours", "days", "months", "years"), ...) ## S3 method for class 'POSIXt' ceil(x, units = c("secs", "mins", "hours", "days", "months", "years"), ...) roundPOSIXt(x, digits = c("secs", "mins", "hours", "days", "months", "years"))
x |
date to be ceilinged, truncated, or rounded |
units |
unit to that is is rounded up or down to. |
digits |
same as |
... |
further arguments to be passed to or from other methods. |
An object of class POSIXlt
.
Charles Dupont
Date
POSIXt
POSIXlt
DateTimeClasses
date <- ISOdate(1832, 7, 12) ceil(date, units='months') # '1832-8-1' truncPOSIXt(date, units='years') # '1832-1-1' roundPOSIXt(date, digits='months') # '1832-7-1'