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FTP server of the Time Department
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 2013
What time is it?
No leap second in June 2014
FTP server of the Time Department
Related articles
Recommended values of standard frequencies
Recent publications of the Time Department
Direct access
Introduction
Data
Publications
Scales
Links
Time Dissemination
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Time Signals
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Rates of clocks contributing to TAI
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Weights of clocks contributing to TAI
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Frequency drifts of clocks contributing to TAI
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TT(BIPMXY) computation ending in 19XY or 20XY


Starting April 2003:
[TAI – GPS time] and [UTC – GPS time],[TAI – GLONASS time] and [UTC – GLONASS time]
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Starting 1993:
Difference between the normalized frequencies of EAL and TAI
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TAI frequency
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Measurements of the duration of the TAI scale interval
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Mean fractional deviation of the TAI scale interval from that of TT
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[TAI – GPS time] and [UTC – GPS time]
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[TAI – GLONASS time] and [UTC – GLONASS time]
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Local representation of UTC: values of [UTC - UTC(lab)]
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Independent local atomic time scales: local values of [TAI - TA(lab)]
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Until 1992:
Local representations of UTC: Values of [UTC – UTC(lab)]
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Local values of [TAI – TA(lab)]
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For the period 1993-1998, these files are issued from tables in the BIPM Time Section Annual Report. The Annual Reports published up to 1998 additionally include the following tables:

  •  
  • Frequency offsets and step adjustments of UTC
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  • Relationship between TAI and UTC
  •  
  • Acronyms and locations of the timing centres which maintain a UTC(k) and/or TA(k)
  •  
  • Equipment and source of UTC(k) of the laboratories contributing to TAI
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  • International GPS tracking schedules (until the Annual Report for 1997)
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  • International GLONASS tracking schedules (until the Annual Report for 1997)
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  • Corrections for homogeneous use of the clock rates published in the current and previous annual reports
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  • Statistical data on the weights of the clocks contributing to TAI

    Starting with the BIPM Time Section Annual Report for 1999, some tables traditionally included in the printed version are only available in electronic form. At present, the Annual Report includes the following tables:
  •  
  • Frequency offsets and step adjustments of UTC
  •  
  • Relationship between TAI and UTC
  •  
  • Acronyms and locations of the timing centres which maintain a UTC(k) and/or TA(k)
  •  
  • Equipment and source of UTC(k) of the laboratories contributing to TAI
  •  
  • Corrections for homogeneous use of the clock rates published in the current and previous annual reports
  •  
  • Statistical data on the weights of the clocks contributing to TAI
    Information compiled about worldwide time signals and a report on the scientific work of the BIPM Time Section are also included.

    Related articles

    Recommended values of standard frequencies
    Recent publications of the Time Department