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Form block date/time field change from AM/PM to 24-hour format

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I tell you I've tried searching so much and I've found so many topics talking about changing certain definitions in config/site.php, but it didn't help.

Can anybody just give me a short and sweet answer how I can change the format of the date-time field of the form block to represent 24 hours instead of using AM / PM?
 
hutman replied on at Permalink Best Answer Reply
hutman
In your /config/site.php add this line and it will change your date to 24 hour format

define('DATE_FORM_HELPER_FORMAT_HOUR', 24);
Evert replied on at Permalink Reply
Awesome, thank you so much!
willabc replied on at Permalink Reply
Do you know how to do this for version 7 and 8? They got rid of site.php so I'm not sure how to do this now. I'm assuming it is an array option for concrete.php or app.php but I can't find any documentation on this.