From http://www.organognosi.com/send-to-clipboard-the-selected-text-in-the-browser-the-source-url-and-the-current-date-and-time/

Copy with URL and date.scpt

tell application "Google Chrome"
	tell front window
		set theClip to active tab execute javascript "(function(){clip = window.getSelection();
url = location.href;
var brackets = \"\\[\\[\";
var myDate = new Date();
var year = myDate.getFullYear();
var month = myDate.getMonth();
if(month < = 9)
	month = month + 1
    month = '0'+month;
var day= myDate.getDate();
if(day < = 9)
    day = '0'+day;
var prettyDate = year +'-'+ month +'-'+ day;
var minutes = myDate.getMinutes();
if(minutes < = 9)
	minutes = '0' + minutes; 
var hours = myDate.getHours();
if(hours < = 9)
	hours = '0' + hours;
theFinalString = clip + \" (\" + url + \" - \" + brackets + prettyDate + \"]] \" + hours + \":\" + minutes + \")\";
return theFinalString;}());"
	end tell
	set the clipboard to theClip
end tell