docs/esp8266: Add ntptime usage to esp8266 quickref.
@@ -243,6 +243,12 @@ See :ref:`machine.RTC <machine.RTC>` ::
rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time
rtc.datetime() # get date and time
+ # synchronize with ntp
+ # need to be connected to wifi
+ import ntptime
+ ntptime.settime() # set the rtc datetime from the remote server
+ rtc.datetime() # get the date and time in UTC
+
Deep-sleep mode
---------------
