da = new Date(document.lastModified) // Create a Date Object set to the last modifed date 
db = da.toGMTString() // Convert to a String in "predictable formt" 
dc = db.split(" ") // Split the string on spaces 
if ( eval( dc[3] ) < 1970 ) dc[3] = eval( dc[3] ) +100 // Correct any date purporting to be before 1970 
db = dc[1] + " " + dc[2] + " " + dc[3] // Ignore day of week and combine date, month and year 
document.write ( "Last Updated " + db ) // Display the result