What is a Day-Count Convention?
A day-count convention is a method of counting the days betweendates.
How Does a Day-Count Convention Work?
It may sound simple to say, "six months from now, we'll send you a check," but what day is "six months from now"? Let's assume today is January 1. Various dates equate to "six months from now":
- If you simply choose the sixth month of the year, you get June 1.
- If you divide 365 days by two and add the result to January 1, you get July 2.
- If you assume there are 30 days in a month (times six months), you get May 31.
None of these consider that it might be a leap year, either.
As you can see, the method for calculating "six months from now" needs defining. For this reason, bond issuers set forth day-count conventions.
Why Does a Day-Count Convention Matter?
The most common kind of day-count convention is the 30/360 convention, which assumes that there are 30 days in each month and therefore just 360 days in a investing. Day-count conventions also determine how interest, swaps and other debt-based vehicles work. In turn, they influence the calculations of returns from those .
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