The message "Wrong start/end time: Daylight Saving Time" indicates an error or discrepancy related to the transition into or out of Daylight Saving Time (DST). DST involves adjusting the clocks forward by one hour during the warmer months to extend evening daylight, and then back by an hour in the cooler months to return to standard time. This adjustment can complicate scheduling and timekeeping in various systems and devices.

Specifically, when clients encounter this message, it is usually because you are attempting to add an event for a time that does not exist due to the DST adjustment.

For example, when the clocks are set forward, there is a one-hour period (typically from 2:00 AM to 3:00 AM) that is skipped. If you trie to schedule something during this non-existent hour, the system recognizes this impossibility and generates the error message "Wrong start/end time: Daylight Saving Time."

This serves as an alert to the user that the entered time is incorrect or invalid due to the absence of that hour in the schedule because of DST changes. The system's failure to adjust for DST automatically or a misunderstanding by the user about the DST transition can lead to such errors, signaling that a review or correction of the time entered is necessary to align with actual timekeeping.

Be aware: the time will not be saved and will be switched back to what it was before.