firstof | R Documentation |
Enable fast creation of time stamps corresponding to the first or last observation in a specified time period.
firstof(year = 1970, month = 1, day = 1, hour = 0, min = 0, sec = 0, tz = "")
year,month,day |
numerical values to specify a day |
hour,min,sec |
numerical vaues to specify time within a day |
tz |
timezone used for conversion |
A wrapper to the R function ISOdatetime with defaults corresponding to the first or last possible time in a given period.
An object of class POSIXct.
Jeffrey A. Ryan
ISOdatetime
firstof(2000)
firstof(2005,01,01)
lastof(2007)
lastof(2007,10)
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