Answers for "check is date passed moment js"

moment check valid date

var date = moment("2016-10-19");
var check = date.isValid();
console.log(check);

how to counts date from moment js

Math.trunc(
                moment.duration(moment(post_date, "YYYY-MM-DD").diff(
                  moment(pre_date, "YYYY-MM-DD")
                )
                ).asDays())