var first = new Date("2019-01-01");
var last = new Date("2019-01-29");
var current = new Date("2019-01-15");
console.log((current.getTime() - first.getTime()) / (last.getTime() - current.getTime()));
/* console.log(first.getTime()); */
console.log(0);
console.log(current.getTime() - first.getTime());
console.log(last.getTime() - first.getTime());
console.log((current.getTime() - first.getTime()) / (last.getTime() - first.getTime()))
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