I've heard that expression all my life. It is basically a cute way of saying that members of the Church are chronically late. I began to wonder if it is just us, so, with the power of Google, I ran some searches to see.
This was one of those Ultra-Mormon weeks where everyone in our family had multiple church activities to attend. There was something every day of the week, except Monday. I was standing with a friend, waiting for one of them to start and noticed that hardly anyone was there. He shrugged his shoulders and said, "Mormon Standard Time."
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