| SCHOOL CALENDAR 2023 / 2024 |
| Start of the school year - WELCOME DAY |
September 21 |
| Start of the 1st semester classes |
September 21 |
| School holidays // Christmas |
December 18 to January 2 |
| End of the 1st semester |
January 27 |
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| Inter-semester Break // Assessment and Tutorial Guidance |
January 29 to Feabruary 3 |
| Deadline to post the grades // 1st semester |
Until February 5 |
| Exam Registration |
February 6 until February 10 |
| School holidays // Carnival |
February 12 to February 13 |
| EXAMS, 1st semester |
February 14 to February 24 |
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| Start of the 2nd semester classes |
February 26 |
| School holidays // Easter |
March 25 to April 1 |
| ISEC Lisboa Day |
May 19 |
| End of the 2nd semester classes |
June 15 |
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| Inter-semester Break // Assessment and Tutorial Guidance |
June 17 to June 22 |
| Deadline to post the grades // 2nd semester |
Until June 24 |
| Exam Registration |
June 25 until June 29 |
| EXAMS, 2nd semester |
July 2 to July 13 |
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| Exams Special Period, Student Worker and Final-Year Students |
July 15 to July 31 and September 2 to September 14 |
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| Re-enrolment of students who do not take exams in the 2nd semester nor special period |
June 25 to July 13 |
| Re-enrolment of students who took exams in the 1st call of the 2nd semester |
Until July 31 |
| Re-enrolment of students who took exams in the Special Period for Student Worker |
Until September 20 |
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| Exam Registration for Final-Year Students – Special Period |
October 1 to October 31 |
| Exams for Final-Year Students – Special Period |
November 15 to December 14 |
| END OF SCHOOL YEAR |
December 30 |