VariantTimeToDosDateTime Function

Converts the variant representation of a date and time to MS-DOS date and time values.

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INT VariantTimeToDosDateTime( 
  double  vtime,                  
  unsigned short *  pwDosDate,  
  unsigned short *  pwDosTime  
);

vtime

The variant time to convert.

pwDosDate

Pointer to the location to store the converted MS-DOS date.

pwDosTime

Pointer to the location to store the converted MS-DOS time.

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

Value

Meaning

TRUE

Success.

FALSE

Failure.

A variant time is stored as an 8-byte real value (double), representing a date between January 1, 100 and December 31, 9999, inclusive. The value 2.0 represents January 1, 1900; 3.0 represents January 2, 1900, and so on. Adding 1 to the value increments the date by a day. The fractional part of the value represents the time of day. Therefore, 2.5 represents noon on January 1, 1900; 3.25 represents 6:00 A.M. on January 2, 1900, and so on. Negative numbers represent the dates prior to December 30, 1899.

For a description of the MS-DOS date and time formats, see DosDateTimeToVariantTime.

The VariantTimeToDosDateTime 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.

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