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   1 var isDate = require('../lang/isDate');
   2
   3     /**
   4      * return the day of the year (1..366)
   5      */
   6     function dayOfTheYear(date){
   7         return (Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()) -
   8                 Date.UTC(date.getFullYear(), 0, 1)) / 86400000 + 1;
   9     }
  10
  11     module.exports = dayOfTheYear;
  12
  13