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73760 maechler 1 
#### Test R's (64-bit) date-time functions .. output tested *sloppily*
64342 ripley 2 
 
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## R's internal fixes are used on 32-bit platforms.
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## macOS gets these wrong: see HAVE_WORKING_64BIT_MKTIME
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Sys.setenv(TZ = "UTC")
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(z <- as.POSIXct("1848-01-01 12:00"))
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c(unclass(z))
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(z <- as.POSIXct("2040-01-01 12:00"))
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c(unclass(z))
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(z <- as.POSIXct("2040-07-01 12:00"))
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c(unclass(z))
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Sys.setenv(TZ = "Europe/London")  # pretty much portable.
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(z <- as.POSIXct("1848-01-01 12:00"))
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c(unclass(z))
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## We don't know the operation of timezones next year let alone in 2040
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## but these should at least round-trip
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## These got the wrong timezone on Linux with glibc 2.2[67]
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as.POSIXct("2040-01-01 12:00")
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as.POSIXct("2040-07-01 12:00")
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Sys.setenv(TZ = "EST5EDT")  # also pretty much portable.
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(z <- as.POSIXct("1848-01-01 12:00"))
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c(unclass(z))
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## see comment above
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as.POSIXct("2040-01-01 12:00")
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as.POSIXct("2040-07-01 12:00")
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## PR15613: had day as > 24hrs.
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as.POSIXlt(ISOdate(2071,1,13,0,0,tz="Etc/GMT-1"))$wday
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as.POSIXlt(ISOdate(2071,1,13,0,1,tz="Etc/GMT-1"))$wday
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75348 ripley 35 
## Incorrect use of %b should work even though abbreviation does match
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old <- Sys.setlocale("LC_TIME", "C") # to be sure
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stopifnot(!is.na(strptime("11-August-1903", "%d-%b-%Y")))