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FTP server of the BIPM Time Department
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]
View
[TAI – GLONASS time] and [UTC – GLONASS time]
View
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
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  • 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.

    Other international metrology data centres:





    International metrology publications
    SI Brochure
    Guides in metrology
    Metrologia
    Circular T
    IERS Conventions Center
    Recommended values of standard frequencies
    Related articles
    International reference timescales
    Recent publications of the BIPM Time Department