var today = new Date().toLocaleDateString('en', {weekday:'long'}); code example
Example: toLocaleDateString() options
new Date("1983-March-25").toLocaleDateString('fr-CA', { year: 'numeric', month: '2-digit', day: '2-digit' })
'03/25/1983'new Date("1983-March-25").toLocaleDateString('fr-CA', { year: 'numeric', month: '2-digit', day: '2-digit' })
'03/25/1983'