react-dates/esm/utils/isPreviousDay.js

A responsive and accessible date range picker component built with React

import moment from 'moment';
import isSameDay from './isSameDay';
export default function isPreviousDay(a, b) {
  if (!moment.isMoment(a) || !moment.isMoment(b)) return false;
  var dayBefore = moment(a).subtract(1, 'day');
  return isSameDay(dayBefore, b);
}