daysBetween daysBetween(Date, Date): Number Returns the number of days between two dates. Parameters Name Description from From date (a Date type). to To date (a Date type). Note that if the to date is earlier than the from date, the function returns a negative number equal to the number of days between the two dates. Example This example returns the number of days between the specified dates. Source %dw 2.0 output application/json --- { days : daysBetween('2016-10-01T23:57:59-03:00', '2017-10-01T23:57:59-03:00') } Output { "days" : 365 }