In some books of manners, times about sexual intercourse and the effect of those times on the child to be born are mentioned. They are not obligatory judgments that need to be followed. However, it will be useful not harmful to take those times into considerations. 
Times recommended for sexual intercourse:
Monday, Tuesday, Thursday and Friday nights and days before noon.
The times that are not recommended for sexual intercourse:
1- Sunday and Wednesday nights.
2- The first, fifteenth and last nights of the moon calendar.
3- The nights of eid al-fitr and eid al-adha,
4- The night of Barat (the fifteenth night of the month of Shaban);
5- The night when one intends to set off;
6- In the afternoon.
They are all recommendations. They will not be regarded makrooh if there exists a danger of looking at a woman lustfully. On the contrary, it will be necessary to have a sexual intercourse with one’s wife. Days and times are not taken into consideration. Let me clarify a point that is asked a lot about: in the lunar calendar, the night of a day is the night before the day. For instance, Friday night is the night connecting Thursday and Friday.