AT & T will no longer give out a phone number for the time of day after September 19th
http://www.latimes.com/business/la-fi-lazarus29aug29,0,2466396,full.column?coll=la-home-center

Here are some internet sources to find out the exact time:
Naval Observatory Time http://tycho.usno.navy.mil/cgi-bin/timer.pl
UTC Universal Time Coordinated http://www.timester.com/verpais.cgi?iso=US
World Time Zone Calendar http://www.indiana.edu/~animal/fun/conversions/worldtime.html
Pay Number : http://tf.nist.gov/stations/sig.html
Decimal Time of Day http://www.decimaltime.hynes.net/times.html

Here in Southern California, we have been experiencing blackouts, and it helps to have a standard to reset our clocks. Our digital clocks are electrical and lose their ability to show the correct time.
So having the Internet source for the time of day will help.