BIPM Circular T is a monthly publication of the Time Department, source of traceability to Coordinated Universal Time (UTC) for the local realizations UTC(k ) maintained by national institutes. Circular T provides the values of the differences [UTC – UTC (k )] every five days, for about 80 institutes regularly contributing clock and clock comparison data to the BIPM. It includes also other information relevant to the computation of these values.
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no. 312 - December 2013
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no. 300 - December 2012
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no. 132 - December 1998
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no. 120 - December 1997
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no. 109 - January 1997
no. 108 - December 1996
no. 107 - November 1996
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no. 100 - April 1996
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no. 440
no. 439 - July 2024
no. 438 - June 2024
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no. 436 - April 2024
no. 435 - March 2024
no. 434 - February 2024
no. 433 - January 2024
no. 432 - December 2023
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no. 427 - July 2023
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no. 425 - May 2023
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no. 423 - March 2023
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no. 421 - January 2023
no. 420 - December 2022
no. 419 - November 2022
no. 418 - October 2022
no. 417 - September 2022
no. 416 - August 2022
no. 415 - July 2022
no. 414 - June 2022
no. 413 - May 2022
no. 412 - April 2022
no. 411 - March 2022
no. 410 - February 2022
no. 409 - January 2022
no. 408 - December 2021
no. 407 - November 2021
no. 406 - October 2021
no. 405 - September 2021
no. 404 - August 2021
no. 403 - July 2021
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no. 401 - May 2021
no. 400 - April 2021
no. 399 - March 2021
no. 398 - February 2021
no. 397 - January 2021
no. 396 - December 2020
no. 395 - November 2020
no. 394 - October 2020
no. 393 - September 2020
no. 392 - August 2020
no. 391 - July 2020
no. 390 - June 2020
no. 389 - May 2020
no. 388 - April 2020
no. 387 - March 2020
no. 386 - February 2020
no. 385 - January 2020
no. 384 - December 2019
no. 383 - November 2019
no. 382 - October 2019
no. 381 - September 2019
no. 380 - August 2019
no. 379 - July 2019
no. 378 - June 2019
no. 377 - May 2019
no. 376 - April 2019
no. 375 - March 2019
no. 374 - February 2019
no. 373 - January 2019
no. 372 - December 2018
no. 371 - November 2018
no. 370 - October 2018
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no. 368 - August 2018
no. 367 - July 2018
no. 366 - June 2018
no. 365 - May 2018
no. 364 - April 2018
no. 363 - March 2018
no. 362 - February 2018
no. 361 - January 2018
no. 360 - December 2017
no. 359 - November 2017
no. 358 - October 3017
no. 357 - September 2017
no. 356 - August 2017
no. 355 - July 2017
no. 354 - June 2017
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no. 352 - April 2017
no. 351 - March 2017
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no. 349 - January 2017
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no. 001 - January 1988
no. 002 - February 1988
no. 003 - March 1988
no. 004 - April 1988
no. 005 - May 1988
no. 006 - June 1988
no. 007 - July 1988
no. 008 - August 1988
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no. 011 - November 1988
no. 012 - December 1988
no. 013 - January 1989
no. 014 - February 1989
no. 015 - March 1989
no. 016 - April 1989
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no. 024 - December 1989
no. 025 - January 1990
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no. 030 - June 1990
no. 031 - July 1990
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no. 033 - September 1990
no. 034 - October 1990
no. 035 - November 1990
no. 036 - December 1990
no. 037 - January 1991
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no. 043 - July 1991
no. 044 - August 1991
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no. 046 - October 1991
no. 047 - November 1991
no. 048 - December 1991
no. 049 - January 1992
no. 050 - February 1992
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no. 052 - April 1992
no. 053 - May 1992
no. 054 - June 1992
no. 055 - July 1992
no. 056 - August 1992
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no. 059 - November 1992
no. 060 - December 1992
no. 061 - January 1993
no. 062 - February 1993
no. 063 - March 1993
no. 064 - April 1993
no. 065 - May 1993
no. 066 - June 1993
no. 067 - July 1993
no. 068 - August 1993
no. 069 - September 1993
no. 070 - October 1993
no. 071 - November 1993
no. 072 - December 1993
no. 073 - January 1994
no. 074 - February 1994
no. 075 - March 1994
no. 076 - April 1994
no. 077 - May 1994
no. 078 - June 1994
no. 079 - July 1994
no. 080 - August 1994
no. 081 - September 1994
no. 082 - October 1994
no. 083 - November 1994
no. 084 - December 1994
no. 085 - January 1995
no. 086 - February 1995
no. 087 - March 1995
no. 088 - April 1995
no. 089 - March 1995
no. 090 - June 1995
no. 091 - July 1995
no. 092 - August 1995
no. 093 - September 1995
no. 094 - October 1995
no. 095 - November 1995
no. 096 - December 1995
no. 097 - January 1996
no. 098 - February 1996
no. 099 - March 1996
no. 100 - April 1996
no. 101 - May 1996
no. 102 - June 1996
no. 103 - July 1996
no. 104 - August 1996
no. 105 - September 1996
no. 106 - October 1996
no. 107 - November 1996
no. 108 - December 1996
no. 109 - January 1997
no. 110 - February 1997
no. 111 - March 1997
no. 112 - April 1997
no. 113 - May 1997
no. 114 - June 1997
no. 115 - July 1997
no. 116 - August 1997
no. 117 - September 1997
no. 118 - October 1997
no. 119 - November 1997
no. 120 - December 1997
no. 121 - January 1998
no. 122 - February 1998
no. 123 - March 1998
no. 124 - April 1998
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BIPM Circular T has been published without interruption since 1 March 1988. The quality of the results has increased progressively following the progress made in clocks and time and frequency transfer techniques, in parallel with the constant improvement in the treatment of the data at the BIPM. The contents and presentation of Circular T have also evolved; from January 2016 an interactive HTML version gives access to complete information about the local time scales and the time links used for clock comparison.