Hi,
im attaching modified version of the date zimlet, with this Zimbra can recognize dates in spanish formats inside the emails.
For spanish format im also including names in spanish, like: marzo, lunes, etc.
So now if you have:
próximo lunes in your email, zimbra will recognize it.
Thanks
PD: This if for Zimbra 4.5 only, the 5 version is comming.