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280 days past LMP is found by checking the day of the week of the LMP and adjusting the calculated date to land on the same day of the week.
Using the example above, 8 May 2009 is a Tuesday.
The calculated date ( 15 February ) is a Friday ; adjusting to the closest Tuesday produces 12 February, which is exactly 280 days past 8 May.
The calculation method does not always result in a 280 days because not all calendar months are the same length, it does not account for leap years.

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