Struct DatedifFn 

pub struct DatedifFn;

Returns the difference between two dates in a requested unit.

Remarks

• Supported units are "Y", "M", "D", "MD", "YM", and "YD".
• If start_date > end_date, the function returns #NUM!.
• Unit matching is case-insensitive.
• "YD" uses a Feb-29 normalization strategy that can differ slightly from Excel in edge cases.
• Input serials are interpreted with Excel 1900 date mapping.

Examples

title: "Difference in days"
formula: '=DATEDIF(44197, 44378, "D")'
expected: 181

title: "Complete months difference"
formula: '=DATEDIF(44197, 44378, "M")'
expected: 6

related:
  - DAYS
  - YEARFRAC
  - DATE
faq:
  - q: "How are unit strings interpreted in DATEDIF?"
    a: "Unit text is case-insensitive, but only Y, M, D, MD, YM, and YD are supported; other units return #NUM!."

Trait Implementations

impl Debug for DatedifFn

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

Formats the value using the given formatter.

impl Function for DatedifFn

[formualizer-docgen:schema:start] Name: DATEDIF Type: DatedifFn Min args: 3 Max args: 3 Variadic: false Signature: DATEDIF(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 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 variadic(&self) -> bool

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.