On Mon, 11 Apr 2016, Stefano Sofia <stefano.so...@regione.marche.it> writes:
> Dear R-list users,
> I need to use strptime because I have to deal with date with hours and
> minutes.
> I read the manual for strptime and I also looked at many examples, but when I
> try to apply it to my code, I always encounter some problems.
> I try to change the default format, with no success. Why? How can I change
> the format?
>
> 1.
> init_day <- as.factor("2015-02-24-00-30")
> strptime(init_day, format="%Y-%m-%d-%H-%M")
> [1] "2015-02-24 00:30:00"
> It works, but why also seconds are shown if in format seconds are not
> specified?
>
> 2.
> init_day <- as.factor("2015-02-24-0-00")
> strptime(init_day, format="%Y-%m-%d-%H-%M")
> [1] "2015-02-24"
> Again, the specified format is not applied. Why?
>
> Thank you for your attention and your help
> Stefano
strptime creates a POSIXlt object, and the specified format
tells it how to interpret the string you pass in. (Your
factor is converted to character by strptime.)
If you want to have the POSIXlt object printed in a
particular way, use ?strftime or ?format.
> format(strptime(init_day, format="%Y-%m-%d-%H-%M"), "%Y-%m-%d-%H-%M")
## [1] "2015-02-24-00-00"
--
Enrico Schumann
Lucerne, Switzerland
http://enricoschumann.net
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