[1] Man page of GETTIMEOFDAY (2019-04-14 12:33:29 +09:00) https://linuxjm.osdn.jp/html/LDP_man-pages/man2/gettimeofday.2.html

[2] [tz] Java & Rearguard (2019-06-04 05:20:03 +09:00) https://mm.icann.org/pipermail/tz/2019-June/028048.html

[3] [tz] Java & Rearguard (2019-06-04 06:45:54 +09:00) https://mm.icann.org/pipermail/tz/2019-June/028049.html

[4] [tz] Java & Rearguard (2019-06-04 09:24:22 +09:00) https://mm.icann.org/pipermail/tz/2019-June/028052.html