Question

[Fiiasco-Exalt]

How can I add a counter for how many days my site has been online?

[Muhammed Zakir]

You want to add a counter to your website or to a thread in this forum?

[Vod]

How can I counter add a counter for how many days my site has been online?

Depends on what language you want to use.  It's straightforward to do, since all you want to do is display the date difference (in days) between today and the date your website started up.

[CoinFoxs]

You want to add a counter to your website or to a thread in this forum?

I think he want to add a counter on is site, That his site will be launch after these Hour, min, second

[Fiiasco-Exalt]

You want to add a counter to your website or to a thread in this forum?

I think he want to add a counter on is site, That his site will be launch after these Hour, min, second

No I Just want a little html code that will increase by 1 everyday and says above it "Total Day Online:"

[Muhammed Zakir]

You can do: current_date - date_your_site_was_online.

You may get useful code from https://www.easycalculation.com/date-day/add-subtract-dates.php.

[rigel]

No I Just want a little html code that will increase by 1 everyday and says above it "Total Day Online:"

You can't do it in HTML: you need PHP, ASP, ASPX, CGI, whatever...