Time zones drive me nuts. I am not even sure if tzselect has side effects, that is if it really changes your system clock, or keeps the absolute time constant.
Whatever, you first have to check your real system time with date. Then you know how your computer interprets time. And then you can check /var/log/syslog. You see soon enough on which clock your cron process runs. Especially with the 1 minute trigger.
No, you do not have to alter anything in crontab definitions if you change the time zone. Not as far as I know. Cron should look at system time, not absolute time.
Recommendation: leave your hardware clock and system clock in UTC. Always and forever. Let only the application which shows time to a human (your desktop) make the translation from UTC to local.
jlinkels
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