Third token (i.e. day) would span to the end of the string
and conversion to int works just because it stops at first
non-numeric character.

Change-Id: I4f608aafadd634c312f7cfd986966f453bfca872
Reviewed-on: https://gerrit.libreoffice.org/68121
Tested-by: Jenkins
Reviewed-by: Matteo Casalin <matteo.casalin@yahoo.com>