Werk #5747: fix daylight saving time error

Component Reporting & availability
Title fix daylight saving time error
Date Mar 8, 2018
Checkmk Edition Checkmk Enterprise (CEE)
Checkmk Version 1.4.0p27 1.5.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

When the actual time was inside/outside the daylight saving time and a report was outside/inside the daylight saving time the calculated time for the last or next scheduled reports was off by 1h. This is fixed now by using the dateutil library internally.

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