If I undestend the your query, you referer to the lockTime contained in the transaction and never the block timestamp.

The lockTime is a int worth, and this worth rappresent “When the transaction could be unlockd to an inputs” and never “When the transaction was revealed”

Lock time: Defines the primary on the spot wherein the transaction is taken into account legitimate and could be transmitted on the Bitcoin community, represented by an integer worth between Zero and 500 million, assuming totally different meanings based mostly on the worth assigned, that’s:

  • Lock time = 0: the transaction is propagated and executed on the on the spot of
    creation.
  • 0 < LockTime <= 500: the worth is interpreted as a block top, ie the
    transaction can be legitimate solely after the block with top
    equal to the lock time worth has been revealed.
  • Lock time> 500 million: the worth is interpreted as a unix timestamp and
    subsequently the transaction can be legitimate solely after the
    date represented by the lock time worth.

When you imply if the transaction has a timestamp, the reply is 2:

  • Throughout the construction the transaction doesn’t have a timestamp, however
    relatively a lock time.

  • The transaction may have an insertion second within the block, which
    depends upon the block, as a result of it’s he who holds the timestamp as a
    worth.

An actual use case:
  My transaction has a block timestamp equal to 8/23/2019, 2:08:43 PM GMT + 2, this represents the time wherein the miner began the cryptographic problem, and it’s the on the spot wherein the miner has additionally considered my transaction together with it within the block.
My transaction has a lockTime of Zero as a result of it’s a right away execution transaction.

Nobody excuses that my transaction earlier than the block was revealed was ALSO inside another block with a barely totally different timestamp

In order for you have flip an in depth clarification of what and the way a transaction works, I like to recommend this studying on bitcoin book

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