Issue
When starting and stopping time via the Slack Bot it doesn't take account of daylight savings time and sends the time an hour earlier resulting in the wrong start stop time, or "the start time can't be before the stop time" if you started it via the web and stop via Slack.

Solution

Type "/tt connect" in one of your channels, then click on the link provided.
There you'll be able to update your timezone to match your daylight saving settings.

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