I just found this tip on /r/LifeProTips and had to share it.

For any given month, all the multiples of 7 fall on the same day.
February 2012 is a Tuesday month because the 7th, 14th, 21st and 28th all occur on a Tuesday. All you need to remember each month is the day multiples of 7 fall on.

Usage:
“Hey Mum, what date is Dad’s vasectomy this month?”. “The 22nd”. So, 7, 14, 21 is a Tuesday, therefore the 22nd will be a Wednesday. Dad’s vasectomy happens on a Wednesday!

Also: The day a month ends on is the day the next month will be. February 2012 ends on a Wednesday so March 2012 will be a Wednesday month.

 

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