Struct Days360Fn 

pub struct Days360Fn;

Returns the day count between two dates using a 30/360 convention.

Remarks

• method omitted or FALSE uses U.S. (NASD) rules; TRUE uses the European 30E/360 method.
• Inputs are coerced to dates by truncating serials to integer days.
• Serials are interpreted with the Excel 1900 date mapping, not a workbook-specific date system.

Examples

title: "U.S. 30/360 method"
formula: "=DAYS360(40574, 40602)"
expected: 30

title: "European 30E/360 method"
formula: "=DAYS360(40574, 40602, TRUE)"
expected: 28

related:
  - DAYS
  - YEARFRAC
  - DATEDIF
faq:
  - q: "Why does DAYS360 differ from actual day counts?"
    a: "DAYS360 applies 30/360 financial conventions, so month-end dates are adjusted by rule instead of using calendar day totals."

Trait Implementations

impl Debug for Days360Fn

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Function for Days360Fn

[formualizer-docgen:schema:start] Name: DAYS360 Type: Days360Fn Min args: 2 Max args: variadic Variadic: true Signature: DAYS360(arg1: number@scalar, arg2: number@scalar, arg3…: any@scalar) Arg schema: arg1{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg2{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg3{kinds=any,required=true,shape=scalar,by_ref=false,coercion=None,max=None,repeating=None,default=false} Caps: PURE [formualizer-docgen:schema:end]

fn caps(&self) -> FnCaps

Capability flags for this function

fn name(&self) -> &'static str

fn min_args(&self) -> usize

fn variadic(&self) -> bool

fn arg_schema(&self) -> &'static [ArgSchema]

fn eval<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

The unified evaluation path.

fn namespace(&self) -> &'static str

fn volatile(&self) -> bool

fn aliases(&self) -> &'static [&'static str]

Optional list of additional alias names (case-insensitive) that should resolve to this function. Default: empty slice. Implementors can override to expose legacy names. Returned slice must have ’static lifetime (typically a static array reference).

fn function_salt(&self) -> u64

fn eval_reference<'a, 'b, 'c>( &self, _args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Option<Result<ReferenceType, ExcelError>>

Optional reference result path. Only called by the interpreter/engine when the callsite expects a reference (e.g., range combinators, by-ref argument positions, or spill sources).

fn dispatch<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

Dispatch to the unified evaluation path with automatic argument validation.