Samsung UN46ES6100GXZE - Manual (Page 176)

Clock Mode : Set the current time
manually or automatically.
–
Auto : Set the current time
automatically using the time from a
digital channel.
N The antenna must be connected in
order to set the time automatically.
N Depending on the broadcast
station and signal, the auto time
set up may not be correct. In this
case, set the time manually.