# RTC_SetDateTimeAsync

## C Specification

  `#include <nitro/rtc.h>`

      RTCResult RTC_SetDateTimeAsync(
      const RTCDate*    date,
      const RTCTime*    time,
      RTCCallback		callback,
      void*            arg );

## Arguments

`date` | Pointer to the buffer storing date data.
`time` | Pointer to the buffer storing time data.
`callback` | Pointer to the callback function. This callback is called from within the interrupt handler.
`arg` | Argument to pass to the callback function.

## Return Values

If the request succeeds, it returns 0. If the request fails, it returns some numeric value other than 0.

## Description

This function asynchronously writes date and time data to the real time clock. It sends date and time data to ARM7 and returns the process result without waiting for a response from the processor. If this function fails, no operation is performed and no user callback function is called.

## Caution

Do not define parameter values of nonexistent dates or times. However, you may specify a day of the week that does not match the actual calendar. This function requires a PXI interrupt for synchronization. Values are written to the variables specified by the `date` and `time` arguments asynchronously with respect to the function.Because applications cannot change the date, use this API only for debugging during development.

## See Also

`RTC_SetDateTime, RTC_GetDateTime, RTC_GetDateTimeAsync, RTCResult, RTCDate, RTCTime, RTCCallback`

## Revision History

06/27/2005 Added additional text indicating that callback is called from interrupt handler
07/01/2004 Updated description due to unification of time representation
05/18/2004 Initial version

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