A well-written JavaScript date selection control_time and date

Since this is a routine I accidentally found on the Internet, I don’t know the original author, so I apologize to the original author for this!
The complete source code is as follows:

<title>Direct use of JS date control</title> <input type="text" name="txtDate1" readonly onfocus="setday(this);"> Test 1, onfocus event call: <input type="text" name="txtDate2" readonly> Test 2, onclick event call: <input type="button" value="setday" onclick="setday(this,document.all.txtDate2);">
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]