// From 2.12.0 onward moment.updateLocale('en', { meridiem : Function }); // From 2.8.1 to 2.11.2 moment.locale('en', { meridiem : Function });

// Deprecated in 2.8.1 moment.lang('en', { meridiem : Function });

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If your locale uses 'am/pm', Locale#meridiem can be omitted, as those values are the defaults.

If your locale needs any different computation for am/pm, Locale#meridiem should be a callback function that returns the correct string based on hour, minute, and upper/lowercase.

moment.updateLocale('zh-cn', {
    meridiem : function (hour, minute, isLowercase) {
        if (hour < 9) {
            return "早上";
        } else if (hour < 11 && minute < 30) {
            return "上午";
        } else if (hour < 13 && minute < 30) {
            return "中午";
        } else if (hour < 18) {
            return "下午";
        } else {
            return "晚上";
        }
    }
});

Before version 1.6.0, Locale#meridiem was a map of upper and lowercase versions of am/pm.

moment.updateLocale('en', {
    meridiem : {
        am : 'am',
        AM : 'AM',
        pm : 'pm',
        PM : 'PM'
    }
});

This has been deprecated. The 1.6.0 callback function syntax is now used instead.