How to make cron run a script at the right hours?

Question

PHP

Good afternoon!
tell me what's wrong!
*/15 7,8,21,22 * * * wget -qO- ' http://website.ru/post.php?key=key ' DOES NOT WORK every 15 minutes during the specified hours (
and so
*/15 * * * * wget -qO- ' http://site.ru/post.php?key=key ' all ok
Why doesn't it work during the specified hours?

Answer 1

date shows correct time?

Answer 2

write the minutes explicitly, plus avoid the multiplicity of 60,
i.e. 14, 29, 44, 59 7,8,21,22 * * * wget -qO- ' http://site.ru/post.php?key=key

Answer 3

Decided
*/15 replaced with 15,30,45