adding > 2^31 seconds always gives same datetime

[infotroph]

Generating a large period works as expected:

seconds(2^31 + c(-2:2))
# [1] "2147483646S" "2147483647S" "2147483648S" "2147483649S" "2147483650S"

Adding large numbers to a POSIXt works as expected:

origin + 2^31 + c(-2:2)
# [1] "2038-01-19 03:14:06 UTC" "2038-01-19 03:14:07 UTC"
# [3] "2038-01-19 03:14:08 UTC" "2038-01-19 03:14:09 UTC"
# [5] "2038-01-19 03:14:10 UTC"

adding a large period onto a POSIXt overflows with no warning:

origin + seconds(2^31 + c(-2:2))
# [1] "2038-01-19 03:14:06 UTC" "2038-01-19 03:14:07 UTC"
# [3] "1901-12-13 20:45:52 UTC" "1901-12-13 20:45:52 UTC"
# [5] "1901-12-13 20:45:52 UTC"

[vspinu]

It's likely a bug, indeed. Probably integer arithmetic is used somewhere internally. Thanks for reporting.