GA B 15 International filing date

Applicants must carefully consider the date on which an international application is to be filed and accordingly choose an appropriate way of filing to assure timely receipt at the EPO (see point 60).
The international filing date of an application filed with the EPO as receiving Office is the date on which the application is received at the EPO or, in exceptional cases (see points 61-64), at a national patent office of an EPC contracting state acting as filing office on behalf of the EPO.
Each international application has a single filing date. The term "international filing date" should therefore not be interpreted as if there is any further filing date in respect of an international application. The word "international" only refers to the fact that the application concerned was filed as an application under the PCT. 
The (international) filing date is not to be confused with the date of entry into the European phase before the EPO or into any national phase before a designated/elected Office (see Annex II). This means that even after entry into the European phase any reference to the filing date of the international application concerned is a reference to the international filing date (see points 447 ff).

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EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - A General Overview

EPO Guide for Applicants, part II Int. - B The EPO as a PCT receiving Office

EPO Guide for Applicants, part II Int. - E Euro-PCT procedure before the EPO as designated or elected Office

PCT Articles