Windows Dev Center

VarDateFromUdate Function

Converts a time and date converted from MS-DOS format to variant format.

HRESULT VarDateFromUdate(  
  UDATE  *pudateIn,         
  unsigned long  dwFlags,  
  DATE  *pdateOut          
);

pudateIn

[in] Unpacked date.

dwFlags

[in] Returns VAR_VALIDDATE on valid date.

pdateOut

[out] Packed date.

The return value obtained from the returned HRESULT is one of the following.

Value

Meaning

S_OK

Success.

E_INVALIDARG

The input date is not correctly formatted, or one of the other parameters is invalid.

E_OUTOFMEMORY

Out of memory.

The UDATE structure is used with VarDateFromUdate, VarDateFromUdateEx, and VarUdateFromDate. It represents an unpacked date.

typedef struct {
    SYSTEMTIME st;
    USHORT  wDayOfYear;
} UDATE;

The VarDateFromUdate function will accept invalid dates and try to fix them when resolving to a VARIANT time. For example, an invalid date such as 2/29/2001 will resolve to 3/1/2001. Only days are fixed, so invalid month values result in an error being returned. Days are checked to be between 1 and 31. Negative days and days greater than 31 results in an error. A day less than 31 but greater than the maximum day in that month has the day promoted to the appropriate day of the next month. A day equal to zero resolves as the last day of the previous month. For example, an invalid dates such as 2/0/2001 will resolve to 1/31/2001.

Calling VarDateFromUdate has the same effect as calling VarDateFromUdateEx with the LCID 0x0409.

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