NEWS

2026-02-13 5.198.2
  Adjust future leap seconds starting in 2090.
  
2026-01-23 5.197.2
  Adjust future leap seconds starting in 2031.  The next leap second
  is predicted to be a positive leap second on December 31, 2047.
  
2026-01-16 5.196.2
  Adjust future leap seconds starting in 2149.
  Update to IERS Bulletin C 71 which states that UTC - TAI
  will remain at -37 seconds for the next six months, at least.
  
2026-01-02 5.195.2
  Adjust future leap seconds starting in 2030.  The next leap second
  is predicted to be a negative leap second on June 30, 2031.
  
2025-11-28 5.194.2
  Adjust future leap seconds starting in 2030.  The next leap second
  is predicted to be a negative leap second on December 31, 2030.
  
2025-10-31 5.193.2
  Adjust future leap seconds starting in 2067.
  
2025-09-19 5.192.2
  Adjust future leap seconds starting in 2161.
  
2025-08-22 5.191.2
  Adjust future leap seconds starting in 2099.
  
2025-08-15 5.190.2
  Adjust future leap seconds starting in 2029.  The next leap second
  is predicted to be a negative leap second on June 30, 2030.
  
2025-07-25 5.189.2
  Adjust future leap seconds starting in 2047.
  
2025-07-18 5.188.2
  Adjust future leap seconds starting in 2051.
  
2025-07-11 5.187.2
  Adjust future leap seconds starting in 2224.  Update to IERS Bulletin C 70
  which states that UTC - TAI will remain at -37 seconds for the next six
  months, at least.
  
2025-07-04 5.186.2
  Adjust future leap seconds starting in 2150.
  
2025-06-13 5.185.2
  Adjust future leap seconds starting in 2080.
  
2025-06-06 5.184.2
  Adjust future leap seconds starting in 2194.
  
2025-05-30 5.183.2
  Adjust future leap seconds starting in 2029.  The next leap second
  is predicted to be a negative leap second on December 31, 2029.

2025-05-23 5.182.2
  Adjust future leap seconds starting in 2208.
  
2025-04-04 5.181.2
  Adjust future leap seconds starting in 2063.
  
2025-02-21 5.180.2
  Adjust future leap seconds starting in 2063.
  
2025-01-10 5.179.2
  Adjust future leap seconds starting in 2274.  Update to IERS Bulletin C 69
  which states that UTC - TAI will remain at -37 seconds for the next six
  months, at least.
  
2025-01-03 5.178.2
  Adjust future leap seconds starting in 2223.
  
2024-12-27 5.177.2
  Adjust future leap seconds starting in 2141.
  
2024-12-20 5.176.2
  Adjust future leap seconds starting in 2097.
  
2024-11-01 5.175.2
  Adjust future leap seconds starting in 2095.
  
2024-09-27 5.174.2
  Adjust future leap seconds starting in 2142.
  
2024-09-06 5.173.2
  Adjust future leap seconds starting in 2249.   Refer to the 2024 edition
  of POSIX.
  
2024-08-09 5.172.2
  Adjust future leap seconds starting in 2249.
  
2024-08-02 5.171.2
  Adjust future leap seconds starting in 2080.
  
2024-07-26 5.170.2
  Adjust future leap seconds starting in 2275.
  
2024-07-19 5.169.2
  Adjust future leap seconds starting in 2224.
  
2024-07-05 5.168.2
  Adjust future leap seconds starting in 2051.
  
2024-06-28 5.167.2
  Adjust future leap seconds starting in 2332.
  
2024-06-07 5.166.2
  Adjust future leap seconds starting in 2372.
  
2024-05-31 5.165.2
  Adjust future leap seconds starting in 2332.
  
2024-05-24 5.164.2
  Adjust future leap seconds starting in 2218.
  
2024-05-17 5.163.2
  Adjust future leap seconds starting in 2191.
  
2024-05-10 5.162.2
  Adjust future leap seconds starting in 2047.
  
2024-04-26 5.161.2
  Adjust future leap seconds starting in 2067.
  
2024-04-12 5.160.2
  Adjust future leap seconds starting in 2029.  The next leap second
  is predicted to be a negative leap second on June 30, 2029.

2024-04-05 5.159.2
  Adjust future leap seconds starting in 2095.
  
2024-03-22 5.158.2
  Adjust future leap seconds starting in 2278.
  
2024-03-15 5.157.2
  Adjust future leap seconds starting in 2081.
  
2024-03-01 5.156.2
  Adjust future leap seconds starting in 2235.
  
2024-02-23 5.155.2
  Adjust future leap seconds starting in 2029.  The next leap second
  is predicted to be a negative leap second on December 31, 2029.
  
2024-02-16 5.154.2
  Adjust three future leap seconds starting in 2029.  The next leap second
  is predicted to be a negative leap second on June 30, 2030.
  
2024-02-09 5.153.2
  Adjust future leap seconds starting in 2405.
  
2024-02-02 5.152.2
  Adjust future leap seconds starting in 2213.
  
2024-01-26 5.151.2
  Adjust future leap seconds starting in 2211.
  
2024-01-19 5.150.2
  Adjust future leap seconds starting in 2185.
  
2024-01-12 5.149.2
  Adjust future leap seconds starting in 2308.
  
2024-01-05 5.148.2
  Adjust future leap seconds starting in 2308.
  
2023-12-29 5.147.2
  Adjust future leap seconds starting in 2189.
  
2023-12-22 5.146.2
  Adjust future leap seconds starting in 2140.
  
2023-12-15 5.145.2
  Adjust future leap seconds starting in 2170.
  
2023-12-08 5.144.2
  Adjust future leap seconds starting in 2199.
  
2023-12-01 5.143.2
  Adjust future leap seconds starting in 2140.
  
2023-11-25 5.142.2
  Adjust future leap seconds starting in 2189.
  
2023-11-17 5.141.2
  Adjust future leap seconds starting in 2056.
  Use underscores properly when embedding files in the documentation PDF.
  Use backslashes property in read_extraordinary_days_table.py.
  
2023-11-03 5.140.2
  Adjust future leap seconds starting in 2081.
  
2023-10-29 5.139.2
  Adjust future leap seconds starting in 2060.
  
2023-10-28 5.138.2
  Adjust future leap seconds starting in 2439.
  
2023-10-20 5.137.2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on December 31, 2029.
  
2023-10-13 5.136.2
  Adjust future leap seconds starting in 2400.
  
2023-10-07 5.135.2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on June 30, 2029.
  
2023-09-29 5.134.2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a positive leap second on December 31, 2047.
  Remove support for EPEL 8.  I was never comfortable with bypassing
  the rebuild of the PDF, and I don't like Red Hat's license change,
  which diminishes their support of free software.
  
2023-09-22 5.133.2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on June 30, 2029.
  
2023-09-15
  Remove redundant code in int128_to_string found by Facebook / infer.
  
2023-09-15 5.132.2
  Adjust future leap seconds starting in 2034.  The next leap second is
  predicted to be a negative leap second on June 30, 2035.
  
2023-09-08 5.131.2
  Adjust future leap seconds starting in 2419.

2023-09-01 5.130.2
  Adjust future leap seconds starting in 2419.
  
2023-08-18 5.129.2
  Adjust future leap seconds starting in 2132.
  
2023-08-11 5.128.2
  Adjust future leap seconds starting in 2407.
  
2023-08-04 5.127.2
  Adjust future leap seconds starting in 2034.  The next leap second is
  predicted to be a negative leap second on December 31, 2034.
  
2023-07-28 5.126.2
  Adjust future leap seconds starting in 2271.
  
2023-07-21 5.125.2
  Adjust future leap seconds starting in 2033.  The next leap second is
  predicted to be a negative leap second on June 30, 2034.
  
2023-07-14 5.124.2
  Adjust future leap seconds starting in 2167.
  
2023-07-07 5.123.2
  Adjust future leap seconds starting in 2082.

2023-06-30 5.122.2
  Adjust future leap seconds starting in 2328.
  
2023-06-23 5.121.2
  Adjust future leap seconds starting in 2033.  The next leap second is
  predicted to be a negative leap second on December 31, 2033.
  
2023-06-16 5.120.2
  Adjust future leap seconds starting in 2067.
  
2023-06-09 5.119.2
  Adjust future leap seconds starting in 2172.
  
2023-06-02 5.118.2
  Adjust future leap seconds starting in 2032.  The next leap second is
  predicted to be a negative leap second on June 30, 2033.

2023-05-26 5.117.2
  Adjust future leap seconds starting in 2032.  The next leap second is
  predicted to be a negative leap second on December 31, 2032.

2023-05-19 5.116.2
  Update the documentation.  Adjust future leap seconds starting in 2184.
  
2023-05-05 5.115.2
  Adjust future leap seconds starting in 2031.  The next leap second is
  predicted to be a negative leap second on June 30, 2032.

2023-05-05 5.114.2
  Adjust future leap seconds starting in 2031.  The next leap second is
  predicted to be a negative leap second on December 31, 2031.

2023-04-28 5.113.2
  Adjust future leap seconds starting in 2119.

2023-04-21 5.112.2
  Adjust future leap seconds starting in 2119.

2023-04-14 5.111.2
  Adjust future leap seconds starting in 2120.
  
2023-04-07 5.110.2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be a negative leap second on June 30, 2031.
  
2023-03-31 5.109.2
  Adjust future leap seconds starting in 2117.
  
2023-03-24 5.108.2
  Adjust future leap seconds starting in 2093.
  
2023-03-17 5.107.2
  Adjust future leap seconds starting in 2063.
  
2023-03-10 5.106.2
  Adjust future leap seconds starting in 2122.
  
2023-03-03 5.105.2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be a negative leap second on December 31, 2030.

2023-02-24 5.104.2
  Adjust future leap seconds starting in 2098.
  
2023-02-17 5.103.2
  Adjust future leap seconds starting in 2190.
  
2023-02-10 5.102.2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on June 30, 2030.

2023-02-03 5.101.2
  Adjust future leap seconds starting in 2229.
  
2023-01-27 5.100.2
  Adjust future leap seconds starting in 2063.
  
2023-01-13 5.99.2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on December 31, 2029.
  
2023-01-06 5.98.2
  Adjust future leap seconds starting in 2038.
  
2022-12-30 5.97.2
  Adjust future leap seconds starting in 2169.
  
2022-12-23 5:96:2
  Adjust future leap seconds starting in 2028.  The next leap second is
  predicted to be a negative leap second on June 30, 2029.
  
2022-12-16 5:95:2
  Adjust future leap seconds starting in 2214.

2022-12-09 5:94:2
  Adjust future leap seconds starting in 2037.

2022-12-02 5:93:2
  Adjust future leap seconds starting in 2256.

2022-11-25 5:92:2
  Adjust future leap seconds starting in 2069.

2022-11-18 5:91:2
  Adjust future leap seconds starting in 2069.
  
2022-11-11 5:90:2
  Adjust future leap seconds starting in 2028.  The next leap second is
  predicted to be a negative leap second on December 31, 2028.
  
2022-11-04 5:89:2
  Adjust future leap seconds starting in 2197.
  
2022-10-28 5:88:2
  Adjust future leap seconds starting in 2036.
  
2022-10-21 5:87:2
  Adjust future leap seconds starting in 2108.
  
2022-10-14 5:86:2
  Adjust future leap seconds starting in 2027.  The next leap second is
  predicted to be a negative leap second on June 30, 2028.

2022-09-16 5:85:2
  Adjust future leap seconds starting in 2027.  The next leap second is
  predicted to be a negative leap second on December 31, 2027.
  
2022-09-09 5:84:2
  Adjust future leap seconds starting in 2135.
  
2022-08-12 5:83:2
  Adjust future leap seconds starting in 2064.
  
2022-08-05 5:82.2
  Adjust future leap seconds starting in 2064.
  
2022-07-22 5:81:2
  Adjust future leap seconds starting in 2036.
  
2022-07-08 5:80:2
  Update to IERS Bulletin C 64, issued July 5, 2022.
  There will be no leap second at the end of December, 2022.
  Adjust future leap seconds starting in 2036.  
  
2022-07-01 5:79:2
  Adjust future leap seconds starting in 2028.  The next leap second is
  predicted to be a negative leap second on June 30, 2028.

2022-06-10 5:78:2
  Adjust future leap seconds starting in 2037.
  
2022-05-27 5:77:2
  Adjust future leap seconds starting in 2028.  The next leap second is
  predicted to be a negative leap second on December 31, 2028.

2022-05-13 5:76:2
  Adjust future leap seconds starting in 2028.  The next leap second is
  predicted to be a negative leap second on June 30, 2029.
  
2022-05-06 5:75:2
  Adjust future leap seconds starting in 2028.  The next leap second is
  predicted to be a negative leap second on December 31, 2028.
  
2022-04-29 5:74:2
  Adjust future leap seconds starting in 2038.
  
2022-04-15 5:73:2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on June 30, 2029.
  
2022-04-01 5:72:2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be a negative leap second on December 31, 2029.
  
2022-03-18 5:71:2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be a negative leap second on June 30, 2030.
  
2022-03-11 5:70:2
  Adjust future leap seconds starting in 2062.

2022-02-25 5:69:2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be a negative leap second on December 31, 2030.
  
2022-02-21 5:68:2
  The PDF might need the Andika font.
  
2022-02-20 5:68:2
  Adjust future leap seconds starting in 2068.
  
2022-02-19 5:67:2
  Correct the date on the front page of the PDF.
  
2022-02-18 5.67.2
  Adjust future leap seconds starting in 2141.
  
2022-01-07 5.66.2
  Update to IERS Bulletin C 63, issued January 5, 2022.
  There will be no leap second at the end of June, 2022.
  Adjust future leap seconds starting in 2155.

2021-12-10 5.65.2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be a negative leap second on June 30, 2031.
  
2021-11-19 5.64.2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be a negative leap second on December 31, 2030.
  
2021-11-12 5.63.2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be on June 30, 2031, and it will be a negative leap second.
  
2021-10-29 5:62:2
  Adjust future leap seconds starting in 2068.

2021-10-15 5:61:2
  Adjust future leap seconds starting in 2062.  Put a copy of the documenatation
  on Google Drive.
  
2021-09-24 5:60:2
  Adjust future leap seconds starting in 2062.
  
2021-09-10 5:59:2
  Adjust future leap seconds starting in 2072.
  
2021-08-20 5:58:2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be on December 31, 2030, and it will be a negative leap second.
  
2021-07-30 5:57:2
  Adjust future leap seconds starting in 2076.
  
2021-07-23 5:56:2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be on June 30, 2030, and it will be a negative leap second.
  
2021-07-09 5:55:2
  Update to IERS Bulletin C 62, issued July 5, 2021.
  There will be no leap second at the end of December, 2021.
  Adjust future leap seconds starting in 2412.
  
2021-07-02 5:54:2
  Adjust future leap seconds starting in 2088.
  
2021-06-25 5:53:2
  Adjust future leap seconds starting in 2091.
  
2021-06-18 5:52:2
  Adjust future leap seconds starting in 2352.
  
2021-06-11 5:51:2
  Adjust future leap seconds starting in 2287.
  
2021-06-04 5:50:2
  Adjust future leap seconds starting in 2063.
  
2021-05-28 5:49:2
  Adjust future leap seconds starting in 2182.
  
2021-05-21 5:48:2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be on December 31, 2029, and it will be a negative leap
  second.
  
2021-05-14 5:47:2
  Adjust future leap seconds starting in 2073.
  
2021-05-07 5:46:2
  Adjust future leap seconds starting in 2357.
  
2021-04-23 5:45:2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be on June 30, 2029, and it will be a negative leap second.
  
2021-04-16 5:44:2
  Adjust future leap seconds starting in 2245.
  
2021-04-09 5:43:2
  Adjust future leap seconds starting in 2063.
  
2021-04-02 5:42:2
  Adjust future leap seconds starting in 2029.  The next leap second is
  predicted to be on December 31, 2029, and it will be a negative leap
  second.
  
2021-03-26 5:41:2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be on June 30, 2030, and it will be a negative leap second.
  
2021-03-19 5:40:2
  Adjust future leap seconds starting in 2068.
  
2021-03-12 5:39:2
  Adjust future leap seconds starting in 2030.  The next leap second is
  predicted to be on December 31, 2030, and it will be a negative leap
  second.
  
2021-03-05 5:38:2
  Include the latest research on historical values of delta T.
  Adjust essentially all leap seconds before 1825 and in the future.
  The next leap second is now predicted to be on June 30, 2031,
  and it will be a negative leap second.
  
2021-02-26 5:37:2
  Adjust future leap seconds starting in 2104.
  
2021-02-19 5:36:2
  Adjust future leap seconds starting in 2051.
  
2021-02-12 5:35:2
  Adjust future leap seconds starting in 2103.
  
2021-02-05 5:34:2
  Adjust future leap seconds starting in 2055.
  
2021-01-29 5:33:2
  Adjust future leap seconds starting in 2089.
  
2021-01-25 5:32:2
  Do not send random bits to mktime.
  
2021-01-22 5:32:2
  Adjust future leap seconds starting in 2070.
  
2021-01-15 5:31:2
  Adjust future leap seconds starting in 2039.
  
2021-01-08 5:30:2
  There will be no leap second in June 2021.  Adjust future leap
  seconds starting in 2105.

2021-01-01 5:29:2
  Adjust future leap seconds starting in 2064.
  
2020-12-25 5:28:2
  Adjust future leap seconds starting in 2077.
  
2020-12-18 5:27:2
  Adjust future leap seconds starting in 2044.
  
2020-12-04 5:26:2
  Adjust future leap seconds starting in 2070.
  
2020-11-27 5:25:2
  Adjust future leap seconds starting in 2097.
  
2020-11-20 5:24:2
  Adjust future leap seconds starting in 2067.
  
2020-11-13 5:23:2
  Delay the Decmeber 2093 leap second by six months to June 2094.
  
2020-11-06 5:22:2
  Adjust future leap seconds starting in 2023.
  
2020-10-30 5:21:2
  Adjust future leap seconds starting in 2023.
  
2020-10-23 5:20:2
  Adjust future leap seconds starting in 2033.
  
2020-10-16 5:19:2
  Adjust future leap seconds starting in 2062.
  
2020-10-02 5:18:2
  Adjust future leap seconds starting in 2059.
  
2020-09-25 5:17:2
  Adjust almost all future leap seconds starting in 2032.
  
2020-09-04 5:16:2
  Adjust almost all future leap seconds.
  
2020-08-28 5:15:2
  Adjust future leap seconds starting in 2089.
  
2020-08-21 5:14:2
  Adjust future leap seconds starting in 2031.
  
2020-08-14 5:13:2
  Adjust future leap seconds starting in 2073.
  
2020-08-07 5:12:2
  Adjust future leap seconds starting in 2114.
  
2020-07-31 5:11:2
  Adjust future leap seconds starting in 2120.
  
2020-07-24 5:10:2
  Adjust future leap seconds starting in 2055.
  
2020-07-17 5:9:2
  Adjust future leap seconds starting in 2080.
  
2020-07-10 5:8:2
  Update to IERS Bulletin C 60.  Adjust future leap seconds starting in 2066.
  
2020-07=03 5:7:2
  Adjust many future leap seconds starting in 2025.
  
2020-06-26 5:6:2
  Adjust many future leap seconds starting in 2068.
  
2020-06-19 5:5:2
  Adjust many future leap seconds starting in 2063.
  
2020-06-12 5:4:2
  Adjust many future leap seconds starting in 2098.
  
2020-06-05 5:3:2
  Adjust many future leap seconds starting in 2087.
  
2020-05-29 5:2:2
  Adjust many future leap seconds starting in 2106.
  
2020-05-21 5:1:2
  Adjust several distant future leap seconds.
  
2020-05-14 5:0:2
  Add time_utc_to_foreign_local.  Adjust five distant future leap seconds.
  
2020-05-07 4:15:1
  Adjust five distant future leap seconds.
  
2020-04-30 4:14:1
  Convert the PDF to Libertine fonts.  Adjust many distant future
  leap seconds.
  
2020-04-23 4:13:1
  Advance three distant future leap seconds by three or six months.
  
2020-04-16 4:12;1
  Advance seven distant future leap seconds by three or six months.
  
2020-04-15 4:11:1
  Recompute all future leap seconds.
  
2020-04-14 4:10:1
  Recompute all future leap seconds.
  
2020-04-10 4:9:1
  Delay the next five leap seconds by six months.
  
2020-04-03 4:8:1
  Update the README to include Fedora 32.
  
2020-03-20 4:8:1
  Delay the December 2028 leap second by six months to June 2029.
  
2020-02-21 4:7:1
  Delay the December 2023 leap second by six months to June 2024.
  
2020-02-15 4:6:1
  Delay the June 2033 leap second by six months to December 2033.
  
2020-01-31 4:5:1
  Delay the December 2042 leap second by six months to June 2043.
  
2020-01-25 4:4:1
  Delay the June 2023 leap second by six months to December 2023 and
  the June 2028 leap second by six months to December 2028.
  
2020-01-11 4:3:1
  Update to IERS Bulletin C 59, issued January 7, 2020.  There will be
  no leap second at the end of June, 2020.
  
2020-01-03 4:2:1
  Delay the December 2022 leap second by six months to June 2023.
  
2019-12-25 4:1:1
  Add time_test_for_disabled_adjtimex() to the man file.
  
2019-12-20 4:1:1
  Delay the December 2032 leap seconds by six months to June 2033.
    
2019-12-14 4:0:1
  Add time_test_for_disabled_adjtimex.
  
2019-12-13 3:20:0
  Delay the December 2027 leap second by six months to June 2028 and
  the December 2032 leap second by six months to June 2033.
  
2019-12-06 3:19:0
  Delay the June 2022 leap second by six months to December 2022.
  
2019-12-02 3:18:0
  Place the source RPM on github.
  
2019-11-29 3:17:0
  Add a test for adjtimex not working.  Mock bug reported in bugzilla 1778298.
  
2019-11-24 3:16:0
  Remove dependency on jdcal, so we can build on more platforms.
  
2019-11-23 3:16:0
  Delay the June 2027 leap second by six months to December 2027.
  
2019-11-16 3:15:0
  Make a subset of the subroutines work on platforms without a C compiler
  that supports 128-bit integers.  Delay the June 2032 leap second by six
  months to December 2032.
  
2019-11-09 3:14:0
  Simplify the Makefile and clean up the example and test programs for rpmbuild.
  Distribute an RPMBUILD spec file for two RPMs: libtime and libtime-devel.
  Move the source files to their own subdirectories, the examples files
  to theirs, and the test and demo files to theirs.
  
2019-10-31 3:13:0
  Delay the December 2021 leap second by six months to June 2022
  and the June 2037 leap second by six months to December 2037.
  
2019-10-11 3:12:0
  Delay the December 2026 leap second by six months to June 2027,
  and the June 2042 leap second by six months to December 2042.
  Improve the internal description of Julian Day Number.
  
2019-10-04 3:11:0
  Delay the December 2031 leap second by six months to June 2032.
  
2019-09-20 3:10:0
  Delay the June 2021 leap second by six months to December 2021.
  
2019-09-07 3:9:0
  Delay the June 2026 leap second by six months to December 2026.

2019-08-17 3:8:0
  Delay the December 2036 leap second by six months to June 2037.
  
2019-07-27 3:7:0
  Update the leap seconds before 1840 based on the latest research on
  the rotation of the Earth.
  
2019-07-04 3:6:0
  Update to IERS Bulletin C 58, issued July 4, 2019, which
  states that no leap second will be introduced at the end of
  December 2019, so UTC-TAI will remain at -37 seconds for the next six
  months, at least.
  
2019-06-22 3:5:0
  Be more careful with the definition and display of Julian Day Numbers.
  
2019-06-16 3:4:0
  Delay the June 2020 leap second to June 2021 and generally
  adjust the leap seconds by using a new algorithm to predict them.
  
2019-06-09 3:3:0
  Delay the June 2076 leap second by six months to December
  of 2076.
  
2019-06-04 3:2:0
  Delay the June 2036 leap second by six months to December
  of 2036.
  
2019-05-19 3:1:0
  Delay the December 2050 leap second by six months to
  June of 2051.  Add a Python example.
  
2019-04-28 3:0:0
  Add support for Python.  Int128_to_string now takes its value
  argument by reference instead of by value.
  
2019-04-20 2:11:0
  Delay the December 2039 leap second by six months,
  to June 2040, reversing the previous change.
  
2019-04-09 2:10:0
  Advance the June 30, 2040 leap second by six months
  to December 31, 2039.
  
2019-03-30 2:9:0
  Delay the December 2039 leap second by six months to June
  2040, and the June 2065 leap second by six months to
  December 2065.
  
2019-03-24 2:8:0
  Delay the next leap second by six months, from December 2019
  to June 2020.  Adjust some of the other leap seconds in the
  twenty-first century also.  These changes are due to using
  a slightly better method of projecting the rotation of the
  Earth in the future.
  
2019-03-16 2:7:0
  Advance the next leap second by six months, from June 2020
  to December 2019.  Adjust the rest of the leap seconds
  in the twenty-first century also.  These changes are due
  to using a better method of projecting the rotation rate
  of the Earth into the future.
  
2019-01-20 2:6:0
  Advance the June 2095 leap second by six months, moving it
  back to December 2094.
  
2019-01-12 2:5:0
  Update to IERS Bulletin C 57, issued January 7, 2019, which
  states that no leap second will be introduced at the end of June,
  2019, so UTC-TAI will remain at -37 seconds for the next six
  months, at least.
  
2018-12-23 2:4:0
  Delay the December 2094 leap second by six months to June 2095.
  
2018-12-02 2:3:0
  Add information about converting IEEE 1588 (PTP) times to
  readable text.
  
2018-12-01 2:2:0
  Delay the December 2077 leap second six months to June 2078.
  
2018-11-25 2:1:0
  Improve the algorithm for anticipating future leap seconds.
  
2018-11-11 2:0:0
  Replace variable_length_seconds_before_1972 with
  variable_length_seconds_before_year.  To use fixed-length
  seconds always, specify INT_MIN.  To use variable length
  seconds before 1972, specify 1972.
  
2018-10-04 1:15:0
  Update the list of dependencies in the README for Fedora 29.
  
2018-09-30 1:14:0
  Improve the prediction of future leap seconds.
  
2018-09-22 1:13:0
  Move the prediction of the next leap second from December 31, 2020
  to June 30, 2020, based on the IERS predictions of the rotation
  rate of the Earth, projected into the future.
  
2018-07-15 1:12:0
  Update to IERS Bulletin C 56, issued July 5, 2018, which states
  that no leap second will be introduced at the end of December,
  2018, so UTC-TAI will remain at -37 seconds for the next six
  months, at least.
  
2018-05-20 1:11:0
  Move the prediction of the next leap second from June 30, 2020 to
  December 31, 2020, based on the IERS predictions of the rotation
  rate of the Earth, projected into the future.
  
2018-05-06 1:10:0
  Move the prediction of the next leap second from December 31, 2020
  to June 30, 2020, based on the IERS predictions of the rotation
  rate of the Earth, projected into the future.
  
2018-01-15 1:9:0
  Update to IERS Bulletin C 55, issued January 9, 2018, which states
  that no leap second will be introduced at the end of June, 2018,
  so UTC-TAI will remain at -37 seconds for the next six months, at least.
  
2017-12-04 1:8:0
  Add a section on International Atomic Time.
  
2017-11-19 1:7:0
  Add support for pkg-config, make check and make distcheck.
  Recommend CLOCK_REALTIME instead of CLOCK_MONOTONIC because
  CLOCK_MONITONIC does not count while the computer is suspended,
  and therefore can change its epoch while an application is running.
  
2017-10-08 1:6:0
  Improve the MAN file.
  
2017-09-27 1:5:0
  Prepare the distribution kit for github.
  
2017-08-27 1:4:0
  Add a MAN page.
  
2017-07-08 1:3:0
  Use Automake in the build procedure.
  Distribute the software using the customary GNU packaging,
  with the PDF file as its documentation.  Continue to include
  the software in the PDF as embedded files.  Build the PDF
  only if requested.  Update to IERS Bulletin C 54, issued
  July 6, 2017, which states that no leap second will be introduced
  at the end of December, 2017, so UTC-TAI will remain at
  -37 seconds for the next six months, at least.

2017-05-07 1:2:0
  Minor typographical changes, add test_local.c,
  work around compiler over-optimization in int128\_to\_string.

2017-01-27 1:1:0
  Update the Makefile and some of the test programs
  based on feedback from Steve Summit.

2017-01-18 1:0:0
  Added the ability to use variable length seconds before 1972.
  
2017-01-10 0:2:0
  Updated to IERS Bulletin C 53,
  issued January 9, 2017, which states that UTC-TAI
  will remain at -37 seconds for the next six months, at least.
  
2017-01-01 0:1:0
  Added a description of the stat function,
  the list of entry points and the kernel recommendations.
  Handle converting -2^127 to a string.
  
2016-12-21 0:0:0
  Original distribution.