According to MSDN, timestamp
Is a data type that exposes automatically generated, unique binary
numbers within a database. timestamp is generally used as a mechanism
for version-stamping table rows. The storage size is 8 bytes. The
timestamp data type is just an incrementing number and does not
preserve a date or a time. To record a date or time, use a datetime
data type.
You’re probably looking for the datetime
data type instead.