const startDate = '2020-01-01';
const endDate = '2020-03-15';
const diffInMs = new Date(endDate) - new Date(startDate)
const diffInDays = diffInMs / (1000 * 60 * 60 * 24);
const moment = require('moment');
const startDate = '2020-01-01';
const endDate = '2020-03-15';
const diffInDays = moment(endDate).diff(moment(startDate), 'days');
// https://momentjs.com/docs/#/displaying/difference/
const differenceInDays = require('date-fns/differenceInDays');
const startDate = '2020-01-01';
const endDate = '2020-03-15';
const diffInDays = differenceInDays(new Date(endDate), new Date(startDate));
// https://date-fns.org/v2.16.1/docs/differenceInDays
const { DateTime } = require('luxon');
const startDate = '2020-01-01';
const endDate = '2020-03-15';
const diffInDays = DateTime.fromISO(endDate).diff(DateTime.fromISO(startDate), 'days').toObject().days;
// https://moment.github.io/luxon/docs/class/src/datetime.js~DateTime.html#instance-method-diff
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