R help - Jun 2024 - Referencing Sys.Date to a different time zone

R 4.3.1
OS X

Colleagues

Hopefully this question elicits a simple answer.

I am in Europe at present.  When I issue the command:
	Sys.Date()
I would like to be able to obtain the value for Pacific time (which differ for
the first 9 hours of the day),
I would like the process to be automatic, regardless of where in the world I am
located.

Dennis

Dennis Fisher MD
P < (The "P Less Than" Company)
Phone / Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com <http://www.plessthan.com/>





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? Fri, 28 Jun 2024 18:52:26 +0200
Dennis Fisher <fisher at plessthan.com> ?????:
> When I issue the command:
> 	Sys.Date()
> I would like to be able to obtain the value for Pacific time (which
> differ for the first 9 hours of the day)
By the time the value of Sys.Date() is created, it's too late to
discern between Europe and Pacific time. The Date class is intended to
store the integer number of days since 1970-01-01:

unclass(Sys.Date())
# [1] 19902

Only by preserving the time we can get a timezone-dependent date:

format(Sys.time(), '%Y-%m-%d') # uses the current time zone
# [1] "2024-06-28"
format(Sys.time(), '%Y-%m-%d', tz = 'Asia/Vladivostok')
# [1] "2024-06-29"

-- 
Best regards,
Ivan