[1] HuTime - Time Information System (2015-12-25 23:20:29 +09:00 版) http://www.hutime.jp/

[2] Calendar List (2015-12-25 23:20:37 +09:00 版) http://datetime.hutime.org/calendar/

[3] hutime (HuTime Project) ( (2017-04-09 01:59:57 +09:00)) https://github.com/hutime/

[4] HuTime Web API - Calendar Calculation, 2023-02-17T15:26:01.000Z http://ap.hutime.org/cal/

[5] Microsoft Word - はじめに.doc - HuTimeReport_20120320.pdf, 2012-04-06T05:57:24.000Z, 2023-05-19T10:25:07.885Z http://www.h-gis.org/documents/papers/HuTimeReport_20120320.pdf

[6] HyTime は無関係。