The time for uterine opening varies from person to person and depends on many factors, such as the strength of the mother's contractions, the size and position of the fetus, the doctor's prediction, etc. Therefore, the date of ovulation is not a definite answer.

In addition, the size and position of the fetus may also affect the timing of uterine opening. If the fetus is too large, the cervix may open more slowly than expected. If the fetus is too small, the cervix may open faster than expected. Therefore, doctors may predict when the cervix will open based on the size and position of the fetus.

Overall, the timing of dilation varies from person to person and depends on many factors. If pregnant women experience contractions that increase in frequency and intensity, their doctor may recommend surgery on a day during their ovulation period. If a pregnant woman is not sure when the cervix will be dilated, it is best to consult her doctor.