On Jul 23, 2010, at 11:35 AM, David Winsemius wrote:
On Jul 23, 2010, at 11:20 AM, <murali.me...@avivainvestors.com> <murali.me...@avivainvestors.com
> wrote:
Hi folks,
I've got a POSIXct datum as follows:
Sys.time()
[1] "2010-07-23 11:29:59 BST"
I want to convert this to the nearest half-hour, i.e., to
"2010-07-23 11:30:00 BST"
(If the time were "11:59:ss", I want to convert to "12:00:00").
How to achieve this?
Couldn't you just coerce to numeric, divide by 60(sec)*30(half-hour
minutes), round to integer, multiply by 60*30, coerce to POSIXct?
When I tried my method I see that one also needs to add or subtract
the proper number of seconds from Universal Time to get the output
formatting correct. (Probably demonstrates that I do not have the
proper understanding of the right place to employ a TZ specification.).
David Winsemius, MD
West Hartford, CT
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