Is my bio-clock messed up?

Here's the deal-I'm literally unable to take a dump before 9:00 pm. It's been like this for about two weeks. I don't feel any discomfort or anything during the day in fact it just feels like my body got the timing for this function messed up. That's all. It doesn't feel like constipation or anything either.
Is my bio-clock messed up?
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