Visa stamp is only for applying to enter US. Entry into US has to be made on any date BEFORE expiration of visa. Duration of stay is decided by the immigration officer at the port of entry. Usually 6 months stay is granted unless there is a previous history of extension of stay or any other reasons to limit stay.
If you want to extend stay aftre entering US, you need to file I-539 one month before expiration of I-94. There are fees involved and a good reason to extend is also required.
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