Quickly create Duration objects for easy date-time manipulation. The units of the duration created depend on the name of the function called. For Duration objects, units are equal to their most common lengths in seconds (i.e. minutes = 60 seconds, hours = 3600 seconds, days = 86400 seconds, weeks = 604800, years = 31536000).
dseconds(x = 1)dminutes(x = 1)
dhours(x = 1)
ddays(x = 1)
dweeks(x = 1)
dyears(x = 1)
dmilliseconds(x = 1)
dmicroseconds(x = 1)
dnanoseconds(x = 1)
dpicoseconds(x = 1)
numeric value of the number of units to be contained in the duration.
a duration object
When paired with date-times, these functions allow date-times to be manipulated in a method similar to object oriented programming. Duration objects can be added to Date, POSIXt, and Interval objects.
Since version 1.4.0 the following functions are deprecated: eseconds,
eminutes, ehours, edays, eweeks, eyears,
emilliseconds, emicroseconds, enanoseconds,
epicoseconds
# NOT RUN {
dseconds(1)
dminutes(3.5)
x <- as.POSIXct("2009-08-03")
x + ddays(1) + dhours(6) + dminutes(30)
x + ddays(100) - dhours(8)
class(as.Date("2009-08-09") + ddays(1)) # retains Date class
as.Date("2009-08-09") + dhours(12)
class(as.Date("2009-08-09") + dhours(12))
# converts to POSIXt class to accomodate time units
dweeks(1) - ddays(7)
c(1:3) * dhours(1)
#
# compare DST handling to durations
boundary <- as.POSIXct("2009-03-08 01:59:59")
boundary + days(1) # period
boundary + ddays(1) # duration
# }