Description of time span classes in lubridate
A time span can be measured in three ways: as a duration, an interval, or a period.
durations record the exact number of seconds in a time span. They measure the exact passage of time but do not always align with human measurements like hours, months and years.
periods record the change in the clock time between two date-times. They are measured in human units: years, months, days, hours, minutes, and seconds.
intervals are time spans bound by two real date-times. Intervals can be accurately converted to periods and durations.
duration(3690, "seconds")
period(3690, "seconds")
period(second = 30, minute = 1, hour = 1)
interval(ymd_hms("2009-08-09 13:01:30"), ymd_hms("2009-08-09 12:00:00"))
date <- ymd_hms("2009-03-08 01:59:59") # DST boundary
date + days(1)
date + ddays(1)
date2 <- ymd_hms("2000-02-29 12:00:00")
date2 + years(1)
# self corrects to next real day
date3 <- ymd_hms("2009-01-31 01:00:00")
date3 + c(0:11) * months(1)
span <- date2 %--% date #creates interval
date <- ymd_hms("2009-01-01 00:00:00")
date + years(1)
date - days(3) + hours(6)
date + 3 * seconds(10)
months(6) + days(1)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.