Teaser 2814: Today’s Teaser

From The Sunday Times, 28th August 2016 [link]

Today’s Teaser concerns writing a date as a string of six digits. For example, today’s date can be written as 280816. Our puzzle concerns two numbers that add up to a date. I have written down two six-figure numbers and then consistently replaced digits by letters. In this way the two numbers have become:


The sum of these two numbers equals the six-digit date of a Sunday in July, August or September this year.

What is the value of my TEASER?