LOCALE_S2359 and LOCALE_SPM
String for the PM designator (second 12 hours of the day). The maximum number of characters allowed for this string is different for different releases of Windows.
Windows Me/98/95, Windows NT 4.0, Windows 2000: Nine including a terminating null character.
Windows Server 2003 and later: Fifteen including a terminating null character.
Windows 10 added the value LOCALE_SPM as a more readable synonym for LOCALE_S2359.