Method execute

graphlite/src/functions/temporal_functions.rs:206–238

(&self, context: &FunctionContext)

    }

    fn execute(&self, context: &FunctionContext) -> FunctionResult<Value> {
        debug!("Executing DATETIME function");

        // Validate argument count
        context.validate_argument_count(1)?;

        // Get the datetime string argument
        let datetime_str = match context.get_argument(0)? {
            Value::String(s) => s,
            _ => {
                return Err(FunctionError::InvalidArgumentType {
                    message: "DATETIME argument must be a string".to_string(),
                })
            }
        };

        // Parse the ISO 8601 datetime string
        match parse_iso_datetime(datetime_str) {
            Ok(datetime) => {
                debug!(
                    "Successfully parsed datetime: {} -> {}",
                    datetime_str, datetime
                );
                Ok(Value::DateTime(datetime))
            }
            Err(e) => {
                warn!("Failed to parse datetime '{}': {}", datetime_str, e);
                Err(FunctionError::ExecutionError {
                    message: format!("Invalid datetime format '{}': {}", datetime_str, e),
                })
            }
        }
    }
}

/// NOW function - returns current system time