Call Time

Phone numbers that tell you the time are nothing new, but if you really want to know the exact time, the National Institute of Standards and Technology (NIST) are the folks to call, at (303) 499-7111 (located in Colorado) or (808) 335-4363 (Hawaii). The time announced on these numbers are calibrated to NIST's atomic clock, and are normally delayed by less than 30 milliseconds when calling from land lines in the continental United States. According to NIST, the Colorado number receives more than one million calls a year; the one in Hawaii more than 50,000.

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