MX install asks what time format you want - 12-hour AM/PM or 24-hour. I selected the 24-hour format, and, after a post-install reboot, when it got to the Greeter login screen (LightDM GTK+ if I'm not mistaken), the panel at the top was showing time in the 12-hour format.
I logged in and saw that the default Conky also was set to the 12-hour format.
Workarounds to make changes to switch to the 24-hour format:
In the Greeter UI utility (Applications Menu->Settings->LightDM GTK+) on the "Panel" tab in the "Clock format" field changed
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%c
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%a %d %b, %Y %H:%M:%S %Z