FullCalendar treats naive datetime strings as already being in the display timezone, causing double-offset. Appending 'Z' forces correct UTC interpretation before conversion to user timezone. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
FullCalendar treats naive datetime strings as already being in the display timezone, causing double-offset. Appending 'Z' forces correct UTC interpretation before conversion to user timezone. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>