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Time of day
3 messages · Rguy, Brian Ripley, Enrico Schumann
On 25/06/2013 06:59, Rguy wrote:
Is there a simple way to obtain the time of day in R? I want the time of day for computational purposes, not for display. I want to be able to create code like the following: if (time_of_day >= 22:00 & time_of_day <= 06:00) then X otherwise Y
which will not parse and in any case there are no such times.
I realize I could parse a date/time object and extract the time, but hopefully other people have already done this, or there is a straightforward representation of time of day in R that I have not been able to find in the documentation.
> t <- Sys.time() > tt <- format(t, "%H:%M") > tt <= "22:00" && tt >= "06:00" [1] TRUE Note the use of && not &.
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Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
On Tue, 25 Jun 2013, Rguy <rguy at 123mail.org> writes:
Is there a simple way to obtain the time of day in R? I want the time of day for computational purposes, not for display. I want to be able to create code like the following: if (time_of_day >= 22:00 & time_of_day <= 06:00) then X otherwise Y
^^^^^ ^^^^^ this will not work: the times need to be something that R understands, eg, numeric values such as 2200 or character values such as "22:00"
I realize I could parse a date/time object and extract the time, but hopefully other people have already done this, or there is a straightforward representation of time of day in R that I have not been able to find in the documentation.
strftime(Sys.time(), "%H:%M")
Enrico Schumann Lucerne, Switzerland http://enricoschumann.net