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Telephone Time-of-Day Service

The audio portions of the WWV and WWVH broadcasts can also be heard by telephone. The time announcements are normally delayed by less than 30 ms when using land lines from within the continental United States, and the stability (delay variation) is generally < 1 ms. When mobile phones or voice over IP networks are used, the delays can be as large as 150 ms. In the very rare instances when the telephone connection is made by satellite, the time is delayed by more than 250 ms.

To hear these broadcasts, dial (303) 499-7111 for WWV (Colorado), and (808) 335-4363 for WWVH (Hawaii). Callers are disconnected after 2 minutes. These are not toll-free numbers; callers outside the local calling area are charged for the call at regular long-distance rates.

The telephone time-of-day service is used to synchronize clocks and watches and for the calibration of stopwatches and timers. It receives about 2,000 calls per day.

Outages

Date MJD Began (UTC) Ended (UTC)
07 December 2019 58824 1755 1910
06 December 2019 58823 1855 1940
06 December 2019 58823 1537 1605
23 June 2019 58657 1051 1345
19 June 2019 58653 0627 0743
14 June 2019 58648 1745 1820
13 June 2019 58647 1140 1210
10 June 2019 58644 0045 0206
03 June 2019 58637 2147 2337
30 May 2019 58633 1457 1700
26 April 2019 58599 1745 1955
08 April 2019 58581 1820 2210
04 April 2019 58577 0151 0450
24 March 2019 58566 2320 2340
14 March 2019 58556 1610 1915
03 March 2019 58545 1245 2210
21 February 2019 58535 1444 1912
05 February 2019 58519 1150 1821

 

Contacts

Created September 24, 2009, Updated December 9, 2019