How to change clock from AM/PM to 24 hours

Try going to Events Manager Settings and then select the Formatting tab and then select the Date/Time section and change the Time Format from “g:i a” to “G:i”. The Date/Time format is described here: https://www.php.net/manual/en/datetime.format.php

Thanks for the quick reply. I found the places to fix the issue:
Format “H:i” works for events
Definition: “_24HSTARTTIME – #_EVENTLINK” works for me on the calendar.
(I simply changed 12 to 24 in the string above)