Struct DateValueFn 

pub struct DateValueFn;

Parses a date string and returns its date serial number.

Remarks

• Accepted formats are a fixed supported subset (for example YYYY-MM-DD, MM/DD/YYYY, and month-name forms).
• Parsing is not locale-driven; ambiguous text may parse differently than Excel locales.
• Output uses Excel 1900 serial mapping and does not currently switch to workbook 1904 mode.

Examples

title: "Parse ISO date"
formula: '=DATEVALUE("2024-01-15")'
expected: 45306

title: "Parse month-name date"
formula: '=DATEVALUE("Jan 15, 2024")'
expected: 45306

related:
  - DATE
  - TIMEVALUE
  - VALUE
faq:
  - q: "Why can DATEVALUE disagree with locale-specific Excel parsing?"
    a: "This implementation uses a fixed set of accepted formats instead of workbook locale settings, so ambiguous text may parse differently."

Trait Implementations

impl Debug for DateValueFn

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

Formats the value using the given formatter.

impl Function for DateValueFn

[formualizer-docgen:schema:start] Name: DATEVALUE Type: DateValueFn Min args: 1 Max args: 1 Variadic: false Signature: DATEVALUE(arg1: any@scalar) Arg schema: arg1{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.