[Dirvish] expire-rule doesn't trigger--why?

[Przemek Klosowski]

My vault is /d, and /d/przemek/dirvish/default.conf has this:

image-default: %Y-%m-%d
index: gzip
expire-default: +6 weeks
expire-rule:
#Min   Hour    Day     Month   DOW      Expires
*       *       *       *       *       +14 days
*       *       *       *       1       +5 weeks
*       *       1       *       *       +1 year 
*       *       1       1       *       never

Backups seem to go OK, but only the expire-default seems to take; dirvish
seems to ignore my expire-rule.  /d/przemek/dirvish/2008-4-14/summary has:

Bank: /d
vault: przemek
branch: daily
Image: 2008-04-14
Reference: 2008-04-13
Image-now: 2008-04-14 00:01:02
Expire: +6 weeks == 2008-05-26 00:01:02
.....
Backup-begin: 2008-04-14 00:01:02
Backup-complete: 2008-04-14 00:01:17
Status: success