as.POSIXct1970 {fda}

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

Description

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

Usage

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

Arguments

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.

Details

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

Value

Returns a vector of class POSIXct.

Author(s)

Spencer Graves

References

Ramsay, James O., Hooker, Giles, and Graves, Spencer (2009), Functional data analysis with R and Matlab, Springer, New York.

Ramsay, James O., and Silverman, Bernard W. (2005), Functional Data Analysis, 2nd ed., Springer, New York.

Ramsay, James O., and Silverman, Bernard W. (2002), Applied Functional Data Analysis, Springer, New York.

See Also

as.POSIXct, ISOdate, strptime

Examples

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

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