Use Time.Equal() instead simple comparison.

jwt/jwt.go

diff --git a/jwt/jwt.go b/jwt/jwt.go
index 52570f3..feb1712 100644
--- a/jwt/jwt.go
+++ b/jwt/jwt.go
@@ -60,7 +60,7 @@
 		return ErrInvalidSUBClaim
 	}
 	if iat, ok := v.Expected.IssuedAt(); ok {
-		if t, ok := j.Claims().GetTime("iat"); t != iat || !ok {
+		if t, ok := j.Claims().GetTime("iat"); !t.Equal(iat) || !ok {
 			return ErrInvalidIATClaim
 		}
 	}