Steps to Reproduce

<datebox showTodayLink="true" format="dd/MM/yyyy HH:mm"/>

open the datebox dropdown

Actual Result

the date of the today link is formatted including the ":" at the end

Expected Result

only display the date

Root Cause

these 2 methods attempt to perform the splitting between date and time format
https://github.com/zkoss/zk/blob/master/zul/src/archive/web/js/zul/db/Datebox.js#L300
https://github.com/zkoss/zk/blob/master/zul/src/archive/web/js/zul/db/Datebox.js#L332

I don't think all possible date format strings can be split in a reliable way.
It should be possible to define a date and time format separately if the default mechanism fails.

Workaround

Override the getDateFormat and getTimeFormat JS functions to return the expected value
The attachment datebox-today-label.zul shows 2 alternatives

1. splitting by space (where applicable)
2. define a custom dateFormat using a widget attribute