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when does this patent US5876176 expire? [duplicate]

In reference to the patent: US5876176
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EPO publication date

The EPO has so many publication dates for each patent: A1, A2, A3, A4. . . B1, B2, etc. Which should I use as publication date?
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When will this Patent expire 5,669,982 [duplicate]

In reference to the patent: US5669982
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How can the challenge date of an application be extended?

The challenge on Microsoft's patent US 20130063492 states: Availability for Challenge: Open Until at least Sept 14, 2013 How is the "available for challenge" date obtained? What steps must we ...