Time and Date Page Worldtime Service National Institute of Standards and Technology (NIST/U.S.A.) Federal Institute of Physics and Metrology (PTB/Germany) National Research Laboratory of Metrology (NRLM/Japan) Bureau International des Poids et Mesures (BIPM/France) United States Naval Observatory (USNO/U.S.A.) National Physical Laboratory (NPL/United Kingdom) National Research Council (NRC/Canada) National Electrotechnical Institute (NEI/Italy) JPL Frequency Standards Laboratory American National Standards Institute (ANSI/U.S.A.) Institute of Electrical and Electronics Engineers (IEEE) International Organization for Standardization (ISO) International Telecommunications Union (ITU) Internet Engineering Task Force (IETF) Global Positioning System (GPS) Overview GPS Status Information LORAN-C Status Information NAVSTAR GPS Homepage USNO GPS Data and Information Laboratoire Primaire du Temp et des Frequences (LPTF/France) National Institute of Standards and Technology (NIST/U.S.A.) Federal Institute of Physics and Metrology (PTB/Germany) United States Naval Observatory (USNO/U.S.A.) National Physical Laboratory (NPL/United Kingdom)