不同的服务器应该将unix时间戳转换为不同的日期吗？

Whilst working on a UI update for a client, I noticed the dates associated with all the articles were out by a day. I figured I'd screwed something up during my changes, but to be sure, threw together a little php test file that gave me some odd results. The test file is just;Whilst working on a UI update for a client, I n