The last day to file the appeal is **Tuesday, 15 September 2026**.

| Step | Count | Rule |
|---|---|---|
| The judgment was served on 16 July. Because the company is seated in Greece, the appeal period is 30 days from service. | 30 days | Code of Civil Procedure, **Article 518(1)** |
| The day of service is excluded; counting starts on 17 July. | 17–31 July: **15 days** | **Article 144(1)** |
| The period from 1 through 31 August is excluded from the appeal period. | **15 days remain** | **Article 147(2)** |
| Counting resumes on 1 September. | 1–15 September: **15 days**; the 30th day is **15 September** | **Articles 147(2) and 518(1)** |
| 15 September is a Tuesday, so the rule extending a deadline that ends on a nonworking day does not change the date. | **15 September 2026** | **Article 144(2)** |

RESULT: deadline = 2026-09-15; rule = Article 518(1), read with Articles 144(1)–(2) and 147(2) of the Greek Code of Civil Procedure