https://blog.koushki.net/1392/06/%d9%86%d9%85%d8%a7%db%8c%d8%b4-%d8%b2%d9%85%d8%a7%d9%86-uptime-%d8%b3%db%8c%d8%b3%d8%aa%d9%85-%d8%af%d8%b1-%d9%88%db%8c%d9%86%d8%af%d9%88%d8%b2/