javascript date format - vanilla

function formatDate( date, params ) {
 var options = {
 weekday: "short",
 year: "numeric",
 month: "long",
 day: "numeric",
 hour: "2-digit",
 minute: "2-digit",
 timeZone: "UTC",
 timeZoneName: "short",
 };

 if( params ) {
 options = Object.assign( options, params );
 }

 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
 return new Date( date ).toLocaleString( 'en-US', options );
}

formatDate( 'Invalid Date String' ); // bad date

formatDate( new Date() );
formatDate( +new Date() ); // timestamp
formatDate( '2016-08-11' ); // Thu, August 11, 2016, 12:00 AM GMT
formatDate( '08/11/2016' );

// 8/11/2016, 7:00 AM
formatDate( '08/11/2016', {
 weekday: undefined,
 month: "numeric",
 timeZoneName: undefined
} );

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