You can add your anything you like that consists of 8 characters or less. This will replace the AM or PM next to the system time. But you cannot do this if you are using any of our software during the trial period; it will corrupt the trial license.

1. Open RegEdit
2. Go to HKEY_CURRENT_USER\Control Panel\International
3. Add two new String values, "s1159" and "s2359"
4. Right click the new value name and modify. Enter anything you like up to 8 characters.