If you think that exactly on the 15th, three months later you are mistaken.
The difference between time periods and time limits is mainly in the beginning and the end of their expiry. The running of a time period starts on the day on which it was agreed - for example, a probationary period. In contrast to time periods, time limits determined by days start on the day after the event that is decisive for its start.
As regards the end, if the last day of a time limit calculated by days falls on a Saturday, Sunday or public holiday, the last day of the time limit shall be the next following working day. For time periods, these days shall not be taken into account and the end of the probationary period or fixed-term employment relationship may also fall on a weekend or a public holiday.
In a recent Resolution Case No. 6CdoPr/11/2023 of 15 August 2024, the Supreme Court of the Slovak Republic dealt with the issue of the differences between periods and time limits, as well as with the calculation of periods in labour relations.
In the present case, the dispute concerned the calculation of probationary periods. The probationary period agreed for two months began on 10 September 2017. The Supreme Court held that the two-month probationary period expired on 9 November 2017 and not on 10 November 2017.
The Supreme Court concluded that the counting of time periods determined by weeks, months or years cannot therefore be used in the alternative to calculate the time for time limits under Article 122(2) and (3) of the Civil Code.
If you want to end your employment on the last day of your probationary period, remember that it ends on the day preceding the day whose numerical designation in the calendar month coincides with the day from which it started.
„The time period determined in months shall begin on the day on which the fact determining its running occurs and shall normally end on the day preceding the day which coincides in its numerical designation in the calendar month in question with the day from which it began to run.“