R时区GMT和CET转换Unix时间戳

Question

I got a unix timestamp from a GMT-based database wich i want to convert to datetime format. I use R in Germany. Unix timestamp from GMT-based database: 1525732148

I convert it with:

install.packages("anytime")
library(anytime)
anytime(as.numeric(as.character(1525732148)))

Why do i get same date time, independet of system-date?

anytime(as.numeric(as.character(1525732148, tz="GMT")))
anytime(as.numeric(as.character(1525732148, tz="CET")))

Both give me as result: "2018-05-07 22:29:08 UTC"

I expected different results, because of different timezones.

Answer 1

The problem is as follows:

> as.character(1525732148, tz="GMT")
[1] "1525732148"

This is what anytime gets as input. The tz parameter is supposed to be passed to anytime , not to as.character , which swallows without warning any additional parameters it does not recognise. Try anytime(1525732148, tz="GMT") .

> anytime::anytime(1525732148, tz="GMT")
[1] "2018-05-07 22:29:08 GMT"
> anytime::anytime(1525732148, tz="CET")
[1] "2018-05-08 00:29:08 CEST"

See: anytime