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The Date.getDaysInMonth() API returns the number of days in a specific month of a year. 

Parameters
  1. Year
  2. Index of Month (January = 0, December = 11)

Return Value

The number of days in that month

Example
Code Block
languagejavascript
pjs.define("num", { type: "zoned", length: 7, decimals: 2}) 
  
num = Date.getDaysInMonth(2016, 1); 

return num;
// num is now 29 (February 2016 has 29 days)