一応、置いとくので、もっていってください。
gakiblo_v0.2dev.tar.gz

別バグも修正してます。（月別ページのキャッシュが投稿によってクリアされないバグ）
詳細差分情報：
赤が新規、黄が修正

# diff -r gakiblo_v0.1 gakiblo_v0.2
dev
Only in gakiblo_v0.2dev/css: calendar.css
diff -r gakiblo_v0.1/gakiblo_sysroot/include/common.php gakiblo_v0.2dev/gakiblo_sysroot/include/common.php
192a193
> $ret_list[] = 'calendar|' . $month;
289a291
> $ret_list[] = 'calendar|' . $month;
diff -r gakiblo_v0.1/gakiblo_sysroot/include/do_entry.php gakiblo_v0.2dev/gakiblo_sysroot/include/do_entry.php
131c131
<
---
>
134,136c134,136
< $oldrec['date'] == $newrec['date'] or
< $oldrec['status'] == $newrec['status'] or
< $oldrec['category_id'] == $newrec['category_id']
---
> $oldrec['date'] <> $newrec['date'] or
> $oldrec['status'] <> $newrec['status'] or
> $oldrec['category_id'] <> $newrec['category_id']
138c138
< $ret = update_cache( $oldrec['date'], $oldrec['category_id'] );
---
> $ret = update_cache( $oldrec['date'], $oldrec['category_id'], $newrec['category_id'] );
Only in gakiblo_v0.2dev/gakiblo_sysroot/plugins: insert.calendar.php
Only in gakiblo_v0.2dev/gakiblo_sysroot/templates: calendar.tpl
diff -r gakiblo_v0.1/gakiblo_sysroot/templates/index_pc.tpl gakiblo_v0.2dev/gakiblo_sysroot/templates/index_pc.tpl
4a5
> <link rel="stylesheet" href="css/calendar.css" type="text/css" >>
33a35
> {insert name="calendar"}
diff -r gakiblo_v0.1/index.php gakiblo_v0.2dev/index.php
485c485
< } elseif ( $this_is['type'] == 'entry' ){
---
> } elseif ( $this_is['type'] == 'entry' or $this_is['type'] == 'month' ){