Especially when there are a lot of international employees, it’s important that time information can be shown in other languages. This is how you can customize this in COYO:

If you add a new language to COYO as part of multilanguage (multilanguage add-on), the texts for the language keys are set in English by default.

The time information and thus also the addition of am or pm is usual there. In the COYO language keys, the whole thing looks like this: 

 

You have the option of activating this via the language keys. You should ideally use this standard format: HH:mm:ss (TIME_FORMAT_MEDIUM) and HH:mm (TIME_FORMAT_SHORT).