r - 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?

For example, I would like the value

"2012-05-30 20:41:21 UTC"

to be

"20:45"

Answer 1

Indeed, an old question with some helpful answers so far. The last one by giraffhere seems to be the most elegant. however, ist not floor_date but round_date which will do the trick:

lubridate::round_date(x, "15 minutes")