时间戳 提前N天 延迟15天

/*获取初始化时间*/
    dateInit(): void {
        var all = this._commonService.getNowMonthDate2Start()
        var now = this._commonService.date2Time(all.end) // 当前时间戳

        var st2 = Number(now) - (86400 * 15) // 减少15天
        var start = this._commonService.time2Date(st2, false, '-')
        $('#startDate').val(start)

        var ed2 = Number(now) + (86400 * 15) //加15天
        var end = this._commonService.time2Date(ed2, false, '-')
        $('#endDate').val(end)
    }