Hi!
Are you using MappView? In this case it is quite easy to switch between various date and time formats using the “format” property of the DateTimeInput/DateTimeOutput widget:
https://help.br-automation.com/#/en/4/visualization%2Fmappview%2Fguides%2Ffaq%2Fwidgets_faq%2Fwidgets_dt_formatting.html
For the VC4 you can use a textgroup to switch between the formats:
https://help.br-automation.com/#/en/4/visualization%2Fviscompvc4%2Ftextgroup%2Ftextgroup_datetimeformat.html
Best regards
Manfred