Month Names

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

TIP

This requires the UpdateLocale plugin to work

dayjs.extend(updateLocale);

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

Additional token processing

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.

dayjs.updateLocale('en', {
  months: function (dayjsInstance, format) {
    // dayjsInstance is the Day.js object currently being formatted
    // format is the formatting string
    if (/^MMMM/.test(format)) {
      // if the format starts with 'MMMM'
      return monthShortFormat[dayjsInstance.month()];
    } else {
      return monthShortStandalone[dayjsInstance.month()];
    }
  },
});