| Created |
| Associated with 日本標準時改正案 |
| Associated with 日本のゆとりとサマータイムを考える会 |
| Associated with サマータイム制度懇談会 |
| Associated with サマータイムとゆとりを考える国民会議 |
| Associated with Japan Super Daylight-saving Time |
| Associated with JDT で暮す会 |
| Associated with JSDT |
| Associated with JDTで暮す会 |
| Associated with 日本の季節性夏時刻制定運動 |
| Disassociated from 日本標準時改正案 |
| Associated with 日本の夏時刻制度論争 |