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NIST 
National Institute of Standards and Technology - USA Recommended Practices
for Manufacturers and Consumers of WWVB Radio Controlled clocks. NPL
National Physical Laboratory - Great Britain PTB 
Federal Physical and Technical Institute - Germany NICT
National Institute of Information and Communications Technology - Japan metas
metrology and accreditation - Switzerland Bevoelkerungswarnung
Central office for civil defence Time ticker
View the world's time zones Calendars through the ages
Daylight saving time
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