| ３期分類 | 昔 数え月 |
今 満 週−日 |
昔 数え月 |
昔 数え 週−日 |
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| 前期 | 第1 | 0-0 | 0-1 | 0-2 | 0-3 | 0-4 | 0-5 | 0-6 | 1 | 0-1 | 0-2 | 0-3 | 0-4 | 0-5 | 0-6 | 1-0 | |
| 1-0 | 1-1 | 1-2 | 1-3 | 1-4 | 1-5 | 1-6 | 1-1 | 1-2 | 1-3 | 1-4 | 1-5 | 1-6 | 2-0 | ||||
| 2-0 | 2-1 | 2-2 | 2-3 | 2-4 | 2-5 | 2-6 | 2-1 | 2-2 | 2-3 | 2-4 | 2-5 | 2-6 | 3-0 | ||||
| 3-0 | 3-1 | 3-2 | 3-3 | 3-4 | 3-5 | 3-6 | 3-1 | 3-2 | 3-3 | 3-4 | 3-5 | 3-6 | 4-0 | ||||
| 2 | 4-0 | 4-1 | 4-2 | 4-3 | 4-4 | 4-5 | 4-6 | 2 | 4-1 | 4-2 | 4-3 | 4-4 | 4-5 | 4-6 | 5-0 | ||
| 5-0 | 5-1 | 5-2 | 5-3 | 5-4 | 5-5 | 5-6 | 5-1 | 5-2 | 5-3 | 5-4 | 5-5 | 5-6 | 6-0 | ||||
| 6-0 | 6-1 | 6-2 | 6-3 | 6-4 | 6-5 | 6-6 | 6-1 | 6-2 | 6-3 | 6-4 | 6-5 | 6-6 | 7-0 | ||||
| 7-0 | 7-1 | 7-2 | 7-3 | 7-4 | 7-5 | 7-6 | 7-1 | 7-2 | 7-3 | 7-4 | 7-5 | 7-6 | 8-0 | ||||
| 3 | 8-0 | 8-1 | 8-2 | 8-3 | 8-4 | 8-5 | 8-6 | 3 | 8-1 | 8-2 | 8-3 | 8-4 | 8-5 | 8-6 | 9-0 | ||
| 9-0 | 9-1 | 9-2 | 9-3 | 9-4 | 9-5 | 9-6 | 9-1 | 9-2 | 9-3 | 9-4 | 9-5 | 9-6 | 10-0 | ||||
| 10-0 | 10-1 | 10-2 | 10-3 | 10-4 | 10-5 | 10-6 | 10-1 | 10-2 | 10-3 | 10-4 | 10-5 | 10-6 | 11-0 | ||||
| 11-0 | 11-1 | 11-2 | 11-3 | 11-4 | 11-5 | 11-6 | 11-1 | 11-2 | 11-3 | 11-4 | 11-5 | 11-6 | 12-0 | ||||
| 4 | 12-0 | 12-1 | 12-2 | 12-3 | 12-4 | 12-5 | 12-6 | 4 | 12-1 | 12-2 | 12-3 | 12-4 | 12-5 | 12-6 | 13-0 | ||
| 13-0 | 13-1 | 13-2 | 13-3 | 13-4 | 13-5 | 13-6 | 13-1 | 13-2 | 13-3 | 13-4 | 13-5 | 13-6 | 14-0 | ||||
| 14-0 | 14-1 | 14-2 | 14-3 | 14-4 | 14-5 | 14-6 | 14-1 | 14-2 | 14-3 | 14-4 | 14-5 | 14-6 | 15-0 | ||||
| 15-0 | 15-1 | 15-2 | 15-3 | 15-4 | 15-5 | 15-6 | 15-1 | 15-2 | 15-3 | 15-4 | 15-5 | 15-6 | 16-0 | ||||
| 中期 | 5 | 16-0 | 16-1 | 16-2 | 16-3 | 16-4 | 16-5 | 16-6 | 5 | 16-1 | 16-2 | 16-3 | 16-4 | 16-5 | 16-6 | 17-0 | |
| 17-0 | 17-1 | 17-2 | 17-3 | 17-4 | 17-5 | 17-6 | 17-1 | 17-2 | 17-3 | 17-4 | 17-5 | 17-6 | 18-0 | ||||
| 18-0 | 18-1 | 18-2 | 18-3 | 18-4 | 18-5 | 18-6 | 18-1 | 18-2 | 18-3 | 18-4 | 18-5 | 18-6 | 19-0 | ||||
| 19-0 | 19-1 | 19-2 | 19-3 | 19-4 | 19-5 | 19-6 | 19-1 | 19-2 | 19-3 | 19-4 | 19-5 | 19-6 | 20-0 | ||||
| 6 | 20-0 | 20-1 | 20-2 | 20-3 | 20-4 | 20-5 | 20-6 | 6 | 20-1 | 20-2 | 20-3 | 20-4 | 20-5 | 20-6 | 21-0 | ||
| 21-0 | 21-1 | 21-2 | 21-3 | 21-4 | 21-5 | 21-6 | 21-1 | 21-2 | 21-3 | 21-4 | 21-5 | 21-6 | 22-0 | ||||
| 22-0 | 22-1 | 22-2 | 22-3 | 22-4 | 22-5 | 22-6 | 22-1 | 22-2 | 22-3 | 22-4 | 22-5 | 22-6 | 23-0 | ||||
| 23-0 | 23-1 | 23-2 | 23-3 | 23-4 | 23-5 | 23-6 | 23-1 | 23-2 | 23-3 | 23-4 | 23-5 | 23-6 | 24-0 | ||||
| 7 | 24-0 | 24-1 | 24-2 | 24-3 | 24-4 | 24-5 | 24-6 | 7 | 24-1 | 24-2 | 24-3 | 24-4 | 24-5 | 24-6 | 25-0 | ||
| 25-0 | 25-1 | 25-2 | 25-3 | 25-4 | 25-5 | 25-6 | 25-1 | 25-2 | 25-3 | 25-4 | 25-5 | 25-6 | 26-0 | ||||
| 26-0 | 26-1 | 26-2 | 26-3 | 26-4 | 26-5 | 26-6 | 26-1 | 26-2 | 26-3 | 26-4 | 26-5 | 26-6 | 27-0 | ||||
| 27-0 | 27-1 | 27-2 | 27-3 | 27-4 | 27-5 | 27-6 | 27-1 | 27-2 | 27-3 | 27-4 | 27-5 | 27-6 | 28-0 | ||||
| 後期 | 8 | 28-0 | 28-1 | 28-2 | 28-3 | 28-4 | 28-5 | 28-6 | 8 | 28-1 | 28-2 | 28-3 | 28-4 | 28-5 | 28-6 | 29-0 | |
| 29-0 | 29-1 | 29-2 | 29-3 | 29-4 | 29-5 | 29-6 | 29-1 | 29-2 | 29-3 | 29-4 | 29-5 | 29-6 | 30-0 | ||||
| 30-0 | 30-1 | 30-2 | 30-3 | 30-4 | 30-5 | 30-6 | 30-1 | 30-2 | 30-3 | 30-4 | 30-5 | 30-6 | 31-0 | ||||
| 31-0 | 31-1 | 31-2 | 31-3 | 31-4 | 31-5 | 31-6 | 31-1 | 31-2 | 31-3 | 31-4 | 31-5 | 31-6 | 32-0 | ||||
| 9 | 32-0 | 32-1 | 32-2 | 32-3 | 32-4 | 32-5 | 32-6 | 9 | 32-1 | 32-2 | 32-3 | 32-4 | 32-5 | 32-6 | 33-0 | ||
| 33-0 | 33-1 | 33-2 | 33-3 | 33-4 | 33-5 | 33-6 | 33-1 | 33-2 | 33-3 | 33-4 | 33-5 | 33-6 | 34-0 | ||||
| 34-0 | 34-1 | 34-2 | 34-3 | 34-4 | 34-5 | 34-6 | 34-1 | 34-2 | 34-3 | 34-4 | 34-5 | 34-6 | 35-0 | ||||
| 35-0 | 35-1 | 35-2 | 35-3 | 35-4 | 35-5 | 35-6 | 35-1 | 35-2 | 35-3 | 35-4 | 35-5 | 35-6 | 36-0 | ||||
| 10 | 36-0 | 36-1 | 36-2 | 36-3 | 36-4 | 36-5 | 36-6 | 10 | 36-1 | 36-2 | 36-3 | 36-4 | 36-5 | 36-6 | 37-0 | ||
| 37-0 | 37-1 | 37-2 | 37-3 | 37-4 | 37-5 | 37-6 | 37-1 | 37-2 | 37-3 | 37-4 | 37-5 | 37-6 | 38-0 | ||||
| 38-0 | 38-1 | 38-2 | 38-3 | 38-4 | 38-5 | 38-6 | 38-1 | 38-2 | 38-3 | 38-4 | 38-5 | 38-6 | 39-0 | ||||
| 39-0 | 39-1 | 39-2 | 39-3 | 39-4 | 39-5 | 39-6 | 39-1 | 39-2 | 39-3 | 39-4 | 39-5 | 39-6 | 40-0 | ||||
| 11 | 11 | 40-0 | 40-1 | 40-2 | 40-3 | 40-4 | 40-5 | 40-6 | 11 | 40-1 | 40-2 | 40-3 | 40-4 | 40-5 | 40-6 | 41-0 | |
| 41-0 | 41-1 | 41-2 | 41-3 | 41-4 | 41-5 | 41-6 | 41-1 | 41-2 | 41-3 | 41-4 | 41-5 | 41-6 | 42-0 | ||||
| 42-0 | 42-1 | 42-2 | 42-3 | 42-4 | 42-5 | 42-6 | 42-1 | 42-2 | 42-3 | 42-4 | 42-5 | 42-6 | 43-0 | ||||
| 43-0 | 43-1 | 43-2 | 43-3 | 43-4 | 43-5 | 43-6 | 43-1 | 43-2 | 43-3 | 43-4 | 43-5 | 43-6 | 44-0 | ||||
| 12 | 12 | 44-0 | 44-1 | 44-2 | 44-3 | 44-4 | 44-5 | 44-6 | 12 | 44-1 | 44-2 | 44-3 | 44-4 | 44-5 | 44-6 | 45-0 | |
| 45-0 | 45-1 | 45-2 | 45-3 | 45-4 | 45-5 | 45-6 | 45-1 | 45-2 | 45-3 | 45-4 | 45-5 | 45-6 | 46-0 | ||||
| 46-0 | 46-1 | 46-2 | 46-3 | 46-4 | 46-5 | 46-6 | 46-1 | 46-2 | 46-3 | 46-4 | 46-5 | 46-6 | 47-0 | ||||
| 47-0 | 47-1 | 47-2 | 47-3 | 47-4 | 47-5 | 47-6 | 47-1 | 47-2 | 47-3 | 47-4 | 47-5 | 47-6 | 48-0 | ||||
| 早期流産 | |||||||||||||||||
| 後期流産 (死産届が必要） | |||||||||||||||||
| 早産 | |||||||||||||||||
| 正期産 | |||||||||||||||||
| 予定日 (現在：満２８０日、旧：数え２８０日） | |||||||||||||||||
| 過期産 | |||||||||||||||||
| 法令用語 | 前 | 未満 | |||||||||||||||
| 以前 | 以下 | ||||||||||||||||
| 以降 | 以上 | ||||||||||||||||
| 超 | 含まず超え | ||||||||||||||||