changeTime(value){

        let date = new Date(value);

        let y = date.getFullYear();

        let MM = date.getMonth() + 1;

        MM = MM < 10 ? ('0' + MM) : MM;

        let d = date.getDate();

        d = d < 10 ? ('0' + d) : d;

        let h = date.getHours();

        h = h < 10 ? ('0' + h) : h;

        let m = date.getMinutes();

        m = m < 10 ? ('0' + m) : m;

        let s = date.getSeconds();

        s = s < 10 ? ('0' + s) : s;

        return y + '-' + MM + '-' + d + ' ' + h + ':' + m + ':' + s;

      }