NA while using strptime function

Question

Version 1.0.136 of R Studio for Windows 10 Pro X64

I want to test the strptime function, so I provide a time in quotes. I've tried numerous formats, but I always receive a NA response. Why is that?

"October 17, 1986 08:24," in t3

strptime (t3, " percent M percent d, percent Y percent H: percent M")

strptime (t3, " percent B percent d, percent Y percent H: percent M")

strptime (t3, " percent B percent d percent Y percent H: percent M")

strptime (t3, " percent M percent d percent Y percent H: percent M")

strptime (t3, " percent M- percent d- percent Y percent H: percent M")

strptime (t3, " percent B- percent d- percent Y percent H: percent M")