日期：first sunday of april
开始：。
这个节日在各国庆祝 (+1):
俄罗斯.Geologists Day在其他年份
| 开始日期 | |
|---|---|
| Geologists Day 2417 | |
| Geologists Day 2418 | |
| Geologists Day 2419 | |
| Geologists Day 2420 | |
| Geologists Day 2421 | |
| Geologists Day 2422 |
日期：first sunday of april
开始：。
| 开始日期 | |
|---|---|
| Geologists Day 2417 | |
| Geologists Day 2418 | |
| Geologists Day 2419 | |
| Geologists Day 2420 | |
| Geologists Day 2421 | |
| Geologists Day 2422 |