Is Same or Before

This indicates whether the Day.js object is the same or before another supplied date-time.

TIP

This requires the IsSameOrBefore plugin to work

dayjs.extend(isSameOrBefore);
dayjs().isSameOrBefore(dayjs('2011-01-01')); // default milliseconds

If you want to limit the granularity to a unit other than milliseconds, pass it as the second parameter.

dayjs().isSameOrBefore('2011-01-01', 'year');

Units are case insensitive, and support plural and short forms.

List of all available units