The best way to calculate the end of the current month in a piece of code is:

• Hardcode the numbers
• Use a module or function
• Add a month, and subtract the current day
• Add a month, truncate the day, and subtract 1
• Add 1 to the day, test it's legality, and loop until it fails
• Use a default of 30.4 days (30.4167, 30.4375, or 30.43729167)
• Use 28 days for every month and ignore any days that come that
• Issue an update (nearly) every month to fix it for the current month

Somewhat related to: How do you remember the number of days in each month?

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