HKCU\Control Panel\International
| Data type | Range | Default value |
|---|---|---|
| REG_SZ | String | For U.S. English: AM |
Specifies the text or symbols used to indicate that the time displayed is before noon in 12-hour time format.
To change the value of this entry, double-click Regional Options in Control Panel. Click the Time tab and then click the AM symbol drop-down list box.