```js
formatTime(date, format = 'yyyy-MM-dd hh:mm:ss') {
      if (date instanceof Date) {
        const syntaxes = {
          '(y+)': date.getFullYear(),
          '(M+)': date.getMonth() + 1,
          '(d+)': date.getDate(),
          '(h+)': date.getHours(),
          '(m+)': date.getMinutes(),
          '(s+)': date.getSeconds(),
        }
        for (const syntax in syntaxes) {
          const result = format.match(syntax)
          if (result !== null) {
            format = format.replace(result[0], `000${syntaxes[syntax]}`.substr(-(result[0].length)))
          }
        }
        return format
      } else {
        return ''
      }
    }
```