If the timezone is specified with a number e.g. +0900 or so, then let's parse the time as a UTC, and adjust it with the specified time shift. Otherwise, if an area has timezone change, e.g. --- Africa/Casablanca Sun Jun 17 01:59:59 2018 UT = Sun Jun 17 01:59:59 2018 +00 isdst=0 gmtoff=0 Africa/Casablanca Sun Jun 17 02:00:00 2018 UT = Sun Jun 17 03:00:00 2018 +01 isdst=1 gmtoff=3600 Africa/Casablanca Sun Oct 28 01:59:59 2018 UT = Sun Oct 28 02:59:59 2018 +01 isdst=1 gmtoff=3600 Africa/Casablanca Sun Oct 28 02:00:00 2018 UT = Sun Oct 28 03:00:00 2018 +01 isdst=0 gmtoff=3600 --- then we could not determine isdst from the timezone (+01 in the above) and mktime() will provide wrong results. Fixes #26370.
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