Filter by Date using the keywords "before" and "after"

I wanted to search mail for a particular day, and I checked
Gmail Help
Center for Advanced Search operators (https://mail.google.
com/support/
bin/answer.py?answer=7190&topic=1579).

Fortunately, their example was what I needed:
Operator:  "after:", "before:"
Definition:  Search for messages sent during a certain
period of time
Example:  after:2004/04/16 before:2004/04/18
Meaning - Messages sent after April 16, 2004, but before
April 18,
2004.*
*More precisely: Messages sent on April 17, 2004.

I searched for "after:2007/04/15
before:2007/04/17".

UNFORTUNATELY, the search results showed mail dated
2007/04/15,
2007/04/16 and 2007/04/17.  I also noticed that not all
2007/04/15 and
2007/04/17 messages were shown -- they were cut at
approximately mid-
day.

Could this problem possibly involve my being in a different
time-zone
(+8)?


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