Date is formatted correctly but element's textContent displays 'invalid date'

[geopic]

Description of the Issue and Steps to Reproduce:

// No warning in console about deprecation with "value provided is not in a recognised
// RFC2822 or ISO format", but text displays "Invalid date" on the page
element.textContent = moment(entry['date'], View.getSiteValues()['longdate']());

// Deprecation warning in console but text displays the date correctly
element.textContent = moment(entry['date']).format(View.getSiteValues()['longdate']());

I am stuck between having a valid date but getting a deprecation warning in the console or formatting it 'properly' but making the date invalid.

Please include the values of all variables used.

• entry['date'] - moment(moment(), moment.ISO_8601)

• View.getSiteValues()['longdate']() - 'Do MMMM YYYY'

Environment: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Other information that may be helpful:

• The time zone setting of the machine the code is running on
  Thu Nov 08 2018 15:54:38 GMT+0000 (Greenwich Mean Time)

• The time and date at which the code was run
  08/11/2018, 15:54:38

• Any other libraries / tools in use
  Node.js v8.11.1 with Express 4.16.0

[marwahaha]

You can check is the object is valid:
https://momentjs.com/docs/#/parsing/is-valid/