[Fix] Append timestamp suffix for upload jar

[minchowang]

What changes were proposed in this pull request

Issue Number: close #3501

Brief change log

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

Does this pull request potentially affect one of the following parts

• Dependencies (does it add or upgrade a dependency): (yes / no)