adds a custom date field option for grouping data by dates

void addSubField(string name,function functor,string label);


namestringthe name of the date field
functorfunctionthe function for grouping
labelstringthe label for a new option


// groups data relatively to some specific date
var releaseDate = new Date(2017, 10, 10);
pivot.addSubField("when", function (val) { 
    return val > releaseDate ? "After" : "Before" 
}, "Release");
// groups data according to a custom date condition
pivot.addSubField("when", function (val) { 
    return val.getFullYear() + "-" + getMonth(val) 
}, "Year-Month");

See also
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