Werk #19786: Fix ntopng exception when selecting 0-24h hour filter

Component

Ntopng integration

Title

Fix ntopng exception when selecting 0-24h hour filter

Date

May 4, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p2 Not yet released	Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p29 Not yet released	Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, selecting the 0–24h range in the ntopng "Filter by hour" graph caused a backend exception:

time data '1 day, 0:00:00' does not match format '%H:%M:%S'

This happened when the UTC offset pushed the computed end time to exactly midnight (24:00), causing Python's timedelta string representation to use "1 day, 0:00:00" instead of a parseable time format. This has been fixed.

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