Metacat

In the Temporal Coverage of Data section of the NCEAS Data Repository form
(http://knb.ecoinformatics.org/cgi-bin/register-dataset.cgi?cfg=nceas), the
year, month, and day are indicated as being required. However, if you enter a
year, but don't select a month and/or day (leave them as "0"), you don't get an
error message for the missing month and day, and the values that you left as "0"
become "1" (01 01 yyyy).

We should allow the user to provide the year only (month and day would not be
required fields), and the month and day should not be displayed if they were not
selected.