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SitePoint PHP Blog:
PHP Job Interview Task Day of Week Calculation
January 09, 2014 @ 12:14:56

Sometimes during an interview it's difficult to determine the skill set of the person on the other side of the table. One solution to this that's become popular is asking the developer to perform a task of your choosing and watching how they work out the problem. In this new post to the SitePoint PHP blog Bruno Skvorc shares one suggestion for this kind of test - a day of week calculation.

Not so long ago, I was given a job interview task. I was to write a function which deduces the day of the standard 7-day week of ANY calendar (even an imaginary one), provided I know how often leap years happen, if at all, how many months their year has, and how many days each month has. This is a fairly common introductory job-interview task, and in this article I'll be solving and explaining the math behind it.

His task was, given any kind of calendar definition (not necessarily the Gregorian), figure out what day of the week a certain month/day/year combination would fall on. He walks through the entire code to solve the problem, including a bit to output the resulting calendar to an HTML table for each month.

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