<human>: Question: On what date did the CTRC approve the shut down of CBC's analogue transmitters?

Is "On July 31, 2012, at around 11:59 p.m. in each time zone, the remaining 620 analogue transmitters were shut down, leaving the network with 27 digital television transmitters across the country, and some transmitters operated by some affiliated stations." the correct answer?

OPTIONS:
- yes
- no
<bot>: no