Broken SQL on where condition involving timestamp and time string.

Suppose mytable has a field called greenwich, which is in timestamp type. The table is registered through a java bean. The following code used to work in 1.3 and 1.3.1, now it is broken: there are records having time newer 01/14/2015 , but it now returns nothing. This is a block issue for us. Is there any workaround?

SELECT * FROM mytable WHERE greenwich > '2015-01-14'