A 365-day calendar consists of exactly 365 days per year (no leap days), and is primarily used in computer models and as an assumption in every-day calculations. For example, a calculation of a daily rate may use an annual total divided by exactly 365.
Other 365-day calendars 
See also 
- Such as in the NetCDF CF conventions – http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.5/ch04s04.html#calendar
- "Determining Bond and Treasury Bill Prices and Yields". Government of Canada Securities, Department of Finance.
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