– the intergovernmental organization through which Member States act together on
     matters related to measurement science and measurement standards.
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What time is it?

Coordinated Universal Time (UTC), maintained by the BIPM, is the time scale that forms the basis for the coordinated dissemination of standard frequencies and time signals. The UTC scale is adjusted by the insertion of leap seconds to ensure approximate agreement with the time derived from the rotation of the Earth. These leap seconds are inserted on the advice of the International Earth Rotation and Reference Systems Service (IERS).

Physical realizations of UTC – named UTC(k) – are maintained in national metrology institutes or observatories contributing with their clock data to the BIPM.

The time displayed here is for demonstration only, and should not be used as a standard. If you need accurate time, you should refer to any authority responsible for time dissemination services.


Summary
International Atomic Time
Computation of "Rapid UTC" (UTCr)
Clock comparisons
Joint projects
Future work
BIPM calibrations of time transfer equipment
BIPM services in the field of time, frequency and gravimetry
Technical partnerships of the Time Department
Recent publications
BIPM Annual Report on Time Activities 2012
What time is it?
Leap second at the end of 30 June 2012
No leap second at the end of 2013
BIPM Annual Report on Time Activities
Staff of the Department
What time is it?
FTP server of the Time Department