Why is subtracting these two times (in 1927) giving a strange result?

I have seen this same point being posted on HN many times. Just a simple search on 1927 gives the following results on the first page -

https://news.ycombinator.com/item?id=5537601 https://news.ycombinator.com/item?id=2824973 https://news.ycombinator.com/item?id=7427110 https://news.ycombinator.com/item?id=5292612 https://news.ycombinator.com/item?id=7366504 https://news.ycombinator.com/item?id=7023598 https://news.ycombinator.com/item?id=4601633

Is there any way to eliminate these reposts?

I could have bet on my grandmother that Skeet would be the one answering it.

This is why we need to abolish DST. It's just a source of pain.