Retrieve account creation date

I've been trying to find the created date of the AdWords account so that I can fetch reports (using min / max date ranges) in increments so that users can see how stats grew over time. Without knowing the creation time of an account, I just have to set an arbitrary min time for the first increment. I saw this thread (https://groups.google.com/forum/#!topic/adwords-api/32TomWaxyd4) and it asked for a use case so I thought I'd repost because it's quite old. Do you have any recommendations for this use case?

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