Blog Post creationdate has 00:00:00 as time component

The time component of the creationdate of blog posts is always 00:00:00

This produces confusing messages in the blog-posts macro:

"test created by Max Mustermann about 10 hours ago"
It is now 09:57 in the morning, and max was definitively sleeping at night

This must be a new behavior (maybe since 4.x). In previous blog posts the time is set correctly.