@waynesutton You cannot go 14 hours in the past. I'm not sure how that would work with mailchimp: "hey mailchimp, can you send this email 14 hours ago". It might immediately send it, but not sure.
var scheduledTime = moment().zone(0).add('hours', 9).format("YYYY-MM-DD HH:mm:ss");
to postpone the newsletter by 8 hours compared to the original.