Description:
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strtotime("2012-03-21 00:00:01") return value is the same as strtotime("2012-03-21 01:00:01")
both of the are 1332276001
this problem range is 2012-03-21 00:00:00 to 2012-03-21 01:00:00
I don't face this problem in any other dates 

Test script:
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echo date("Y-m-d H:i:s", strtotime("2012-03-21 00:00:01"))."\n";
echo date("Y-m-d H:i:s", strtotime("2012-03-21 01:00:01"))."\n";

Expected result:
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2012-03-21 00:00:01
2012-03-21 01:00:01

Actual result:
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2012-03-21 01:00:01
2012-03-21 01:00:01