// From 2.12.0 onward moment.updateLocale('en', { months : String[] }); moment.updateLocale('en', { months : Function }); moment.updateLocale('en', { months : { format : String[], standalone : String[] } }); // From 2.11.0 moment.locale('en', { months : { format : String[], standalone : String[] } }); // From 2.8.1 to 2.11.2 moment.locale('en', { months : String[] }); moment.locale('en', { months : Function });

// Deprecated in 2.8.1 moment.lang('en', { months : String[] }); moment.lang('en', { months : Function });

---

Locale#months should be an array of the month names.

moment.updateLocale('en', {
    months : [
        "January", "February", "March", "April", "May", "June", "July",
        "August", "September", "October", "November", "December"
    ]
});

If you need more processing to calculate the name of the month, (for example, if there is different grammar for different formats), Locale#months can be a function with the following signature. It should always return a month name.

moment.updateLocale('en', {
    months : function (momentToFormat, format) {
        // momentToFormat is the moment currently being formatted
        // format is the formatting string
        if (/^MMMM/.test(format)) { // if the format starts with 'MMMM'
            return nominative[momentToFormat.month()];
        } else {
            return subjective[momentToFormat.month()];
        }
    }
});

From version 2.11.0 months can also be an object, specifying standalone and format forms (nominative and accusative). The regular expression that is run on the format to check whether to use the format form is /D[oD]?(\[[^\[\]]*\]|\s+)+MMMM?/. From version 2.14.0 a different one can be specified with the isFormat key.

moment.updateLocale('en', {
    months : {
         format: 'sausio_vasario_kovo_balandžio_gegužės_birželio_liepos_rugpjūčio_rugsėjo_spalio_lapkričio_gruodžio'.split('_'),
         standalone: 'sausis_vasaris_kovas_balandis_gegužė_birželis_liepa_rugpjūtis_rugsėjis_spalis_lapkritis_gruodis'.split('_'),
         isFormat: /D[oD]?(\[[^\[\]]*\]|\s+)+MMMM?|MMMM?(\[[^\[\]]*\]|\s+)+D[oD]?/  // from 2.14.0
    }
});