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Date-time must be a POSIXct, POSIXlt, Date, Period, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts objects.
second(x)second(x) <- value
second(x) <- value
the seconds element of x as a decimal number
a date-time object
numeric value to be assigned
x <- ymd("2012-03-26") second(x) second(x) <- 1 second(x) <- 61 second(x) > 2
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