If we have dinner at seven, it will be difficult to see the eight-o'-clock movie.
seven, 7adj
(7 in number)
sedm čísl
There are seven books here.
Je tady sedm knih.
seven, 7adj
(7 years of age) (věk)
sedm čísl
Max is seven now, and in second grade.
seven, 7pron
(people, things: 7 of them)
sedm čísl
Seven of the students failed the exam.
7n
US, written (seventh day of specified month) (v daném měsíci)
sedmého čísl
Poznámka: The example would be spoken "April seventh".
The movie is out in theaters from April 7.
7n
mainly UK, written (seventh day of specified month) (v daném měsíci)
sedmého čísl
Poznámka: The example would be spoken as "(the) seventh of February". This date format is most commonly used in the UK, though it is gaining popularity in the US.
You'd better hurry up and submit your application; 7 February is the deadline.