Time format on List Page Field

On start and end time fields of this list page times are entered in military time. 

NAV is automatically converting the times from military 24hr to standaard 12 hr format. 

How can I disable this feature? 

In other words, users enter a time in military format on a list page and they would liek it to remain in that format but the lsit page is auto converting the time to standard. 

thanks, 

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