How do I identify products manufactured after June 2016?

In the case of spray, S 〇 〇 〇 〇 and the date of manufacture are written on the back side. The spray has no expiration date.

Example) When the manufacturing date is June 1, 2016
S 16 (year) F (month) 1 (day)
：
[Month display symbol]
A: January B: February C: March D: April
E: May F: June G: July H: August
J: September K: October M: November N: December

The undiluted solution and grease type are not listed on the date of manufacture.
The expiration date is two years after opening.