Fix: Bad month return by function
Fix: Bad days returned by function
Missing reprogramming task into GUI for cron module.
Without this, a new task is never executed (because without datenextrun defined)
Merge pull request #1940 from aternatik/fix-cron

Missing reprogramming task into GUI for cron module.
Merge remote-tracking branch 'origin/3.5' into 3.6

Conflicts:
	htdocs/core/lib/date.lib.php