Get/set hours component of a date-time.
Date-time must be a POSIXct, POSIXlt, Date, Period, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts objects.
- a date-time object
the hours element of x as a decimal number
x <- ymd("2012-03-26") hour(x) hour(x) <- 1 hour(x) <- 25 hour(x) > 2
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