# RTC_SetTimeAsync

## C Specification

  `#include <nitro/rtc.h>`

      RTCResult RTC_SetTimeAsync(
                  const RTCTime*    time,
                  RTCCallback       callback,
                  void*             arg );

## Arguments

`time` | Pointer to `RTCTime` containing time information to set.
`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 time data to the real time clock. It sends time data to ARM7 and returns the process result without waiting for a response from the processor. To get the result from the processor, you must use the `result` argument. If this function fails, no operation is performed and no user callback function is called.

## Caution

Do not define parameter values of nonexistent times. Values are set to the RTC as specified by the `time` argument asynchronously. Do not use this variable for anything else until a user callback function confirms the completion of this asynchronous operation.Because applications cannot change the date, use this API only for debugging during development.

## See Also

`RTC_SetTime, RTC_GetTime, RTC_GetTimeAsync, RTCResult, 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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