FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux lwm 3.2.0-74-generic #109-Ubuntu SMP Tue Dec 9 16:45:49 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
System.out.println(Timestamp.valueOf("1980-05-01 00:00:00").getTime());
System.out.println(Timestamp.valueOf("1980-05-01 01:00:00").getTime());

//output
//325962000000
//325962000000
//whenever the time between 1980-05-01 00:00:00 TO 1980-05-01 01:00:00,
//it always been the same value(325962000000) of Timestamp.valueOf();


REPRODUCIBILITY :
This bug can be reproduced always.