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

1. **Start with service.** Because the company is seated in Greece, the appeal period is **30 days from service of the judgment**, under Article 518(1) of the Greek Code of Civil Procedure. The judgment was served on 16 July 2026.
2. **Exclude the day of service.** Under Article 144(1), the count begins on **17 July**. The days from 17 through 31 July use **15 days** of the period.
3. **Skip August.** Article 147(2) excludes **1–31 August** from the Article 518(1) appeal period. **15 days** remain.
4. **Count the remaining days.** September 1 through **September 15** supplies those 15 days. September 15 is a Tuesday, so the non-working-day extension in Article 144(2) does not apply.

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