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trunc.POSIXt returns the date truncated to the specified unit.
ceiling.POSIXt returns next ceiling of the date at the unit selected in
units.
floor.POSIXt trunk.POSIXt by another name.
round.POSIXt returns the date or time value rounded to nearest
specified unit selected in digits. trunc.POSIXt and round.POSIXt have been extended from
the base package functions.
ceil(x, units,...)
"ceil"(x, units, ...)
"trunc"(x, units = c("secs", "mins", "hours", "days",
"months", "years"), ...)
"ceil"(x, units = c("secs", "mins", "hours", "days",
"months", "years"), ...)
"round"(x, digits = c("secs", "mins", "hours", "days", "months", "years"))units but different name to be compatible
with round generic.
POSIXlt.
Date POSIXt POSIXlt DateTimeClassesdate <- ISOdate(1832, 7, 12)
ceil(date, units='months') # '1832-8-1'
trunc(date, units='years') # '1832-1-1'
round.POSIXt(date, digits='months') # '1832-7-1'
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