https://stackoverflow.com/questions/8619879/ javascript-calculate-the-day-of-the-year-1-366
days between 2 date
Date
Date
Integer
should have not allowed to pass null to date value need to use QL_NULL_DATE instead
https://stackoverflow.com/questions/16229494/ converting-excel-date-serial-number-to-date-using-javascript
parse data string to UTC date