var global = {
    key:"",
    rank_key:"",

    getFirstDay:function()
    {
        var dt = new Date();
        var day = dt.getDay() || 7;
        var newdt = new Date(dt.getFullYear(), dt.getMonth(), dt.getDate() + 1 - day);
        newdt.setHours(0);
        newdt.setMinutes(0);
        newdt.setSeconds(0);
        newdt.setMilliseconds(0);      
        return newdt;
    },
    formatDateStr:function(dt)
    {
        return dt.getFullYear() + '-' + (dt.getMonth() + 1) + '-' + dt.getDate();
    },
    rankKey:function()
    {
        var dt = this.getFirstDay();
        this.key = this.formatDateStr(dt);
        this.rank_key = "rank_"+this.key;
    }
};
module.exports = global;