It's really surprising and annoying that the default structured editor for
dates and times in Grails is so limited. It only allows one to edit (or enter)
time information down to the minute. Seconds and smaller are ignored, even
though the editor specifically returns an epoch time in milliseconds with the
getTime() method! The default editor also only works for java.util.Date
and java.sql.Date -- not the also common java.sql.Timestamp.