I dunno, I use a tripartite system of early-, mid-, and late-month determination, wherein mid-month is the entire middle third of the month, roughly speaking. Normally this is about the 10th through the 20th, but with February the math is a bit tougher. It's a popular and useful way of dividing the month, I invite everyone to give it a tryTechnically mid February is the 14th, which is this Sunday, so early next week seems more likely.
Also, mid-century doesn't mean only the years 1850, 1950, etc.
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