Creating a time series in R with a row every 15 minutes

Question

I'm having trouble creating a time series (POSIXct or dttm column) with a row every 15 minutes.

Something that will look like this for every 15 minutes between Jan 1st 2015 and Dec 31st 2016 (here as month/day/year hour:minutes):

1/15/2015 0:00
1/15/2015 0:15
1/15/2015 0:30
1/15/2015 0:45
1/15/2015 1:00

A loop starting date of 01/01/2015 0:00 and then adding 15 minutes until 12/31/2016 23:45?

Does anyone has an idea of how this can be done easily?

Thanks!

Answer 1

Little bit easier to read

library(lubridate)
seq(ymd_hm('2015-01-01 00:00'),ymd_hm('2016-12-31 23:45'), by = '15 mins')

Answer 2

intervals.15.min <- 0 : (366 * 24 * 60 * 60 / 15 / 60)
res <- as.POSIXct("2015-01-01","GMT") + intervals.15.min * 15 * 60
res <- res[res < as.POSIXct("2016-01-01 00:00:00 GMT")]
head(res)
# "2015-01-01 00:00:00 GMT" "2015-01-01 00:15:00 GMT" "2015-01-01 00:30:00 GMT"
tail(res)
# "2015-12-31 23:15:00 GMT" "2015-12-31 23:30:00 GMT" "2015-12-31 23:45:00 GMT"