SystemTimeToVariantTime (Windows CE 5.0)
This function converts the variant representation of time to system time values.
int SystemTimeToVariantTime(SYSTEMTIMElpSystemTime,double* pvtime );
Parameters
- lpSystemTime
[in] Long pointer to the system time. - pvtime
[out] Void pointer to the returned variant time.
Return Values
A non-zero value if the system time was successfully converted to a variant time, zero otherwise.
Remarks
A variant time is stored as an 8-byte real value (double), representing a date between January 1, 1753 and December 31, 2078, 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.
The SYSTEMTIME structure is useful for the following reasons:
- It spans all time/date periods. MS-DOS date/time is limited to representing only those dates between 1/1/1980 and 12/31/2107.
- The date/time elements are all easily accessible without using bit decoding.
- The National Data Support data and time formatting functions GetDateFormat and GetTimeFormat take a SYSTEMTIME value as input. For more information, see the Win32 Programmer's Reference in the Win32 SDK.
- It is the default Win32 time/date data format supported by Microsoft Windows NT® and Windows 95.
Passing invalid (and under some circumstances NULL) pointers to this function causes an unexpected termination of the application.
Requirements
OS Versions: Windows CE 2.0 and later.
Header: Oleauto.h.
Link Library: Oleaut32.lib.
See Also
Automation Functions | SYSTEMTIME | GetDateFormat | GetTimeFormat
Send Feedback on this topic to the authors