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Date.isleap (See related posts)

Date.isleap = function(year){
 return ((year % 400) == 0) ? 1 :
        ((year % 100) == 0) ? 0 :
        ((year % 4)   == 0) ? 1 :
         0;
}
Date.prototype.isleap = function(){
    return Date.isleap(this.getFullYear())
}
// isleap current year
new Date().isleap()
to javascript date by ma.la on Thu Sep 15 21:03:05 -0400 2005

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