Format(MM-DD-YYYY) is invalid in Safari

[Javi-kenjo]

const today = moment().format('MM-DD-YYYY')
const yesterday = moment().format('MM-DD-YYYY')
moment(today).isSame(yesterday) // Chrome: true, Safari: false

const today = moment()
const yesterday = moment()
moment(today).isSame(yesterday) // Chrome: true, Safari: true

[antarilos]

It seems that is because the .format('MM-DD-YYYY') does not comply RFC2822 nor ISO 8601 formats (https://momentjs.com/docs/#/parsing/string/).

For example, with ISO 8601 format:

const today = moment().format('YYYY-MM-DD');
const yesterday = moment().format('YYYY-MM-DD');
const result = moment(today).isSame(yesterday);
console.log(result); // Chrome: true, Safari: true, Firefox: true

With any other format, the format should be set when creating the moment objects (https://momentjs.com/docs/#/parsing/string-format/):

const today = moment().format('MM-DD-YYYY');
const yesterday = moment().format('MM-DD-YYYY');
const result = console.log(moment(today, 'MM-DD-YYYY').isSame(moment(yesterday, 'MM-DD-YYYY')));
console.log(result); // Chrome: true, Safari: true, Firefox: true