Rounding time to nearest quarter hour

Question

I have a vector of POSIXct values and I would like to round them to the nearest quarter hour. I don\'t care about the day. How do I convert the values to hours and minutes?<

Answer 1

Old question, but would like to note that the lubridate package handles this easily now with floor_date. To cut a vector of POSIXct objects to 15 minute intervals, use like this.

x <- lubridate::floor_date(x, "15 minutes")

EDIT: Noted by user @user3297928, use lubridate::round_date(x, "15 minutes") for rounding to the nearest 15 minutes. The above floors it.