lubridate (version 0.2.1)

dseconds: Quickly create exact time spans.

Description

Quickly create exact time spans.

Usage

dseconds(x=1)

Arguments

x

numeric value of the number of units to be contained in the duration.

Value

• a duration object

Details

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).

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.

See Also

duration, new_duration, days

Examples

dseconds(1) 
# 1s
dminutes(3.5) 
# 210s

x <- as.POSIXct("2009-08-03") 
# "2009-08-03 CDT"
x + ddays(1) + dhours(6) + dminutes(30)
# "2009-08-04 06:30:00 CDT"
x + ddays(100) - dhours(8) 
# "2009-11-10 15:00:00 CST"

class(as.Date("2009-08-09") + ddays(1)) # retains Date class
# "Date"
as.Date("2009-08-09") + dhours(12) 
# "2009-08-09 12:00:00 UTC"
class(as.Date("2009-08-09") + dhours(12)) 
# "POSIXt"  "POSIXct"
# converts to POSIXt class to accomodate time units

dweeks(1) - ddays(7) 
# 0s
c(1:3) * dhours(1) 
# 3600s  7200s  10800s
#
# compare DST handling to durations
boundary <- as.POSIXct("2009-03-08 01:59:59")
# "2009-03-08 01:59:59 CST"
boundary + days(1) # period
# "2009-03-09 01:59:59 CDT" (clock time advances by a day)
boundary + ddays(1) # duration
# "2009-03-09 02:59:59 CDT" (clock time corresponding to 86400 seconds later)}