The first pulse of each minute is an 800 ms pulse of 1000 Hz at WWV and 1200 Hz at WWVH. The first pulse of each hour is an 800 ms pulse of 1500 Hz. These pulses are heard every second except on the 29th and 59th seconds of each minute. The most frequent sounds heard on WWV and WWVH are the seconds pulses. The hours are numbered beginning with 00 hours at midnight through 12 hours at noon to 23 hours and 59 minutes just before the next midnight. However, the difference between UTC and local time does change-by 1 hour. When local time changes from Daylight Saving to Standard Time, or vice versa, UTC does not change. The number of hours depends on the number of time zones between your location and the location of the zero meridian (which passes through Greenwich, England). UTC differs from your local time by a specific number of hours. Coordination with the international UTC time scale keeps NIST time signals in close agreement with signals from other time and frequency stations throughout the world. UTC was established by international agreement in 1972, and is governed by the International Bureau of Weights and Measures (BIPM) in Paris, France. The announced time is "Coordinated Universal Time" (UTC). The WWV announcement follows at about 7.5 s before the minute. The WWVH announcement occurs first, at about 15 s before the minute. Voice announcements are made from WWV once every minute.
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