Reader letter: Armed Forces Day

Will someone please explain to me how Armed Forces Day became June 29.

I was furious last year about this matter and wrote to the Citizen stating the fact that my Armed Forces Day flag has June 27 printed on it. This I purchased the first year of official recognition and was supported by another member of the public who also wrote to the Citizen. My flag says 27th. Your paper says 29th and Fenland Hall will fly the flag all week. Who has got it wrong? My flag goes up on the 27.

JH Granger