fda: as.POSIXct1970 – R documentation

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as.POSIXct1970

as.POXIXct for number of seconds since the start of 1970.

as.POSIXct.numeric requires origin to be specified. This assumes that it is the start of 1970.

as.POSIXct1970(x, tz="GMT", ...)

`x`	a numeric vector of times in seconds since the start of 1970. (If `x` is not numeric, call `as.POSIXct`.)
`tz`	A timezone specification to be used for the conversion, if one is required. System-specific (see time zones), but "" is the current timezone, and "GMT" is UTC (Universal Time, Coordinated).
`...`	optional arguments to pass to as.POSIXct.

o1970 <- strptime('1970-01-01', ' o1970. <- as.POSIXct(o1970), as.POSIXct(x, origin=o1970.)

Returns a vector of class POSIXct.

Spencer Graves

sec <- c(0, 1, 60, 3600, 24*3600, 31*24*3600, 365*24*3600)
Sec <- as.POSIXct1970(sec)

all.equal(sec, as.numeric(Sec))

Functional Data Analysis

v5.1.9

GPL (>= 2)

Authors

J. O. Ramsay <ramsay@psych.mcgill.ca> [aut,cre], Spencer Graves <spencer.graves@effectivedefense.org> [ctb], Giles Hooker <gjh27@cornell.edu> [ctb]

Initial release

2020-12-16