Textclock widget with tooltip for different cities/timezones in Awesome WM

rc.lua

-- Add to your rc.lua, 
-- Create a textclock widget
mytextclock = awful.widget.textclock({ align = "right" })
mytestclock_tooltip = awful.tooltip({
    objects = { mytextclock },
    timer_function = function()
    local now = os.time()
    local utcdate = os.date("!*t", now)
    local tehran_t = os.time(utcdate) + (3.5*3600)
    local ljubljana_t = os.time(utcdate) + (1*3600)
    local sydney_t =  os.time(utcdate) + (10*3600)
    local timez = os.date("Tehran: %d %b %Y, %I:%M%P\n", tehran_t)
    .. os.date("Ljubljana: %d %b %Y, %I:%M%P\n", ljubljana_t)
    .. os.date("Sydney: %d %b %Y, %I:%M%P", sydney_t)
    return timez
    end,
})
-- happy fast coding!