3.1.1.6 time interval. part of the time axis (3.1.1.4) limited by two instants (3.1.1.3) and, unless otherwise stated, the limiting instants themselves ISO 8601-1:2019
kikakurui.com
JIS X 0301:2002 p.25、附属書2（参考）JISと対応する国際規格との対比表、kikakurui.com
loc.gov
[1] 3.2 Time scales、The Gregorian calendar has a reference point that assigns 20 May 1875 to the calendar day that the “Convention du Mètre” was signed in Paris.、p.14
[2] 3.2.2 The week calendar、The reference point of the time scale assigns Saturday to 1 January 2000.、p.15
[3] p.20、Values in the range [0000] through [1582] shall only be used by mutual agreement of the partners in information interchange.
