with_tz is not working correctly for POSIXlt objects

[btvedt-liquidnet]

with_tz does not seem to work correctly for POSIXlt objects. According to the documentation with_tz is not supposed to change the actual moment of time being represented. However, for POSIXlt objects it appears to be changing only the time zone.

I believe with_tz was working correctly for POSIXlt objects in lubridate version 1.6.0.

I would expect the following two with_tz calls to return the same moment in time, but they do not. When I run this code usinglubridate version 1.7.8 there is a difference of 5 hours according to difftime.

x <- strptime("2020-04-01 12:34:56", "%Y-%m-%d %H:%M:%OS", tz="UTC")
with_tz(x, "America/New_York")
with_tz(as.POSIXct(x), "America/New_York")

[personlin]

I encounter the same issue!
version 1.7.4 was working correctly.

[vspinu]

This is actually a bug in R itself. Setting tzone attribute on posixlt objects results in a mess :/.

After recent simplification this re-emerged.