Date
From Commontary
1 Peter: Date
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When was it written?
Internal:
There was suffering in the church worldwide (5:9), which suggests a wide-spread persecution.
The church had to be developed enough in the areas of Pontus, Galatia, Cappadocia, Asia, Bithynia for the church to be written (1.1)
External:
Tradition places Peter’s death in Rome in AD 65, and the Neronian persecution began in AD 64.
Conclusion:
Therefore, the letter would be dated soon before Peter’s death, probably about AD 64, when Neronian persecution officially spread the persecution of Christians throughout the whole known (to them) world.