Converting Excel calendar duration to days

[Desiderata]

In previous threads, it has been shared to use =DAYS360(C7,D7,FALSE) to convert calendar duration to days. Why does this formula use 360 days instead of 365 days?

 

[Brianwarnock]

https://support.office.microsoft.co...acf-9b96-299dba1e827f&ui=en-US&rs=en-GB&ad=GB

 

[Desiderata]

Thanks Brianwarnock, this answered my question!