From: Soichi Ishida <lists@...>
Date: 2012-12-26T12:16:26+09:00
Subject: Accumulate total count for each month

I have a file that contains a list of STRING datetime like

Thu Dec 20 00:58:17 +0000 2012
Thu Dec 20 00:50:18 +0000 2012
Thu Dec 20 00:48:53 +0000 2012
Thu Dec 20 00:44:43 +0000 2012
Thu Dec 20 00:42:32 +0000 2012
...

Each line represents the occurrence of one event.
I want to count the number of events occurred each month (or day).

First, I have converted to DateTime objects. It's easy.

Normally, when counting the number of each word occurred in a file,
using hash can help (each word as a key).  But this case, it is not that
simple because the key is date object.

Do you have better ideas for counting the number of events each month?

soichi

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