Timestamp format differing

Hi,

We have a function in whcih we compare the records based on timestamp.
When we run the function in postgres timestamp is in the format "23 Jan 12:59:23 2010"
We are having a functionality in such a way that after loading data into a table this function will be called automatically to compare records in the table.This is done using java.
When the function is called from java application the timestamp format is differing it is like '0026-07-03 00:28:12'.

What might be causing this diffrence?
Please help me to resolve this.

Thanks
S_V