Lubridate timezone handling-CodePudding

I have the following string desribing a date and time in Central European Summer Time: "2021-09-23 12:00:00". In fact, I've got a whole, long column of such time points. For certain reasons I have to handle these times with functions in the 'lubridate' package. Using 'as_datetime' I get

t0 = "2021-09-23 12:00:00"
t1 = as_datetime(t0); t1
## [1] "2021-09-23 12:00:00 UTC"

that is, as_datetime uses the hours and minutes given and adds Universal Time "UTC" as time zone. Supplying the time zone CEST gives instead

t1 = as_datetime(t0, tz = "CEST"); t1
## [1] "2021-09-23 10:00:00 CEST"

that is, changes the time, what I don't want.

What I would like to get (what I really need) is "2021-09-23 12:00:00 CEST", that is changing the time zone without changing the time.

I tried force_tz and with_tz, but that didn't work either.

What I am also wondering is why 'lubridate' converts 12:00:00 UST to 10:00:00 CEST, because CEST is the same as GMT 2 and UTC is GMT 0, so the result should actually be the other way around.

Thanks for any help.

CodePudding user response：

Try:

t0 = "2021-09-23 12:00:00"


library(lubridate)
#1 

t1 = as_datetime(t0, tz = "Europe/Berlin")
[1] "2021-09-23 12:00:00 CEST"

or

#2
t1 = as_datetime(t0, tz = "CST6CDT")

[1] "2021-09-23 12:00:00 CDT"