It says that there are 24 hours between 1pm EST March 10 and 1pm EDT March 11, when there are really 23. It's probably using my IP address (and the original poster's IP address) to pick these timezones, so you may see something different, but it also gives the incorrect number of hours if you specify the timezones:
And get a desired response. In fact it really screws up. Going to keep trying, also I thought that BST kicked in at the end of March. (Google informs me: 25th march)
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[ 4.8 ms ] story [ 69.9 ms ] threadWhat is changing is your time zone from, say, GMT to BST.
This time zone change is listed there. It says 1:00pm EST to 1:00pm EDT on the page linked, and so it is incorrect.
http://www.wolframalpha.com/input/?i=hours+between+1pm+est+m...
Edit: Now I see that the link has both times in EST, which is not on point. See chrisrhoden's link in a sibling to this comment.
http://www.wolframalpha.com/input/?i=Hours+between+1pm+EST+M...
It also gives 0.9583 (23/24) as the amount of days, so one hand doesn't know what the other is doing.
Ergo you can't search;
"hours between 1pm GMT march 10 and 1pm BST march 11 2012" http://www.wolframalpha.com/input/?i=hours+between+1pm+GMT+m...
And get a desired response. In fact it really screws up. Going to keep trying, also I thought that BST kicked in at the end of March. (Google informs me: 25th march)
0.9583 days = 22 hours 59 minutes 57 seconds
the time change does not apply everywhere, in places near the equator there is no daylight saving time change.