Initial logbook request does not zero milliseconds

[amelchio]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.

The problem

When entering http://10.1.2.3:8123/logbook the logbook data is requested with a URL like http://10.1.2.3:8123/api/logbook/2020-06-26T05:00:00.395Z?end_time=2020-06-26T08:00:00.395Z with a random fractional second.

Obviously a small bug but it means that the logbook could miss events happening in the first second of that hour.

Setting a timestamp with the popup works correctly.

Expected behavior

Steps to reproduce

Environment

• Home Assistant release with the issue: 0.112b0
• Last working Home Assistant release (if known):
• Browser and browser version:
• Operating system:

State of relevant entities

Problem-relevant configuration

Javascript errors shown in your browser console/inspector

Additional information