Why does I 864 AOS expire 09/30/2021?

I'm using the most current version (03/10/21) that I downloaded directly from USCIS website. Just curious what that expiration date meant in the top right corner of the 1st page.

submitted by /u/Max_Power742
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source https://www.reddit.com/r/immigration/comments/qyzlvf/why_does_i_864_aos_expire_09302021/

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