JSON 的資料型態不包含 date，往往需另行處理日期相關的運算，頗為麻煩。若能將日期儲存為數值，則於運算時可便利很多。

store date as JSON

var birthday = '1962/7/25';

function date2JSON( dt ) {
    var dayArr = dt.split('/');
    return JSON.parse( '{ "year":' + parseInt( dt[0] ) + ', "month:"' + parseInt( dt[1] ) + ', "day":' + parseInt( dt[3] ) + '}');
    
Usage Example:
var myBirthday = date2JSON( birthday );
==> {"year": 1962, "month": 7, "day": 25}