If clothes, colours, styles, etc. are out of date, they are old and not fashionable.

That radio looks so out of date. 那台收音机看起来真老土。

If information is out of date, it is old and not useful or correct.

an out-of-date phone directory 信息已经过时的电话号码簿

The guidebook I had for Chicago was out of date. 我有的芝加哥旅游手册已经过时了。

If food is out of date, it is old and not now safe to eat.