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TIBCO Rendezvous® 8.8.0

# Get DateTime

Convenience Function

## Declaration

    tibrv_status tibrvMsg_GetDateTime(
       tibrvMsg             message,
       const char*          fieldName,
       tibrvMsgDateTime*    value);
    tibrv_status tibrvMsg_GetDateTimeEx(
       tibrvMsg             message,
       const char*          fieldName,
       tibrvMsgDateTime*    value,
       tibrv_u16            fieldId);

## Purpose

Get the value of a field as a Rendezvous datetime value.

## Remarks

This convenience function retrieves a field and extracts its data.

Since it is not possible to convert any other datatype to a datetime value, the field must already contain a datetime. Otherwise, the function returns TIBRV_CONVERSION_FAILED.

Pointer data extracted from the field remain valid until the message is destroyed; that is, even removing the field or updating the field’s value does not invalidate pointer data.

This function produces values that are read-only snapshots of the field data (see Pointer Snapshot). Programs must not modify the datetime value.

Parameter | Description
`message` | Get the specified field of this message.
`fieldName` | Get a field with this name.
`value` | The program supplies a location in this parameter, and the function stores a pointer to the field value in that location.
`fieldId` | Get the field with this identifier. Zero is a special value that signifies no field identifier. All non-zero field identifiers must be unique within each message.

## Example

This example code extracts a datetime value from a message field, and converts it to a `time_t` value. Programs can adapt this code as appropriate. (For corresponding code to convert a `time_t` value to a datetime value, and add the datetime to a message field, see the example at Add DateTime.)

    #include <limits.h>
    tibrv_status
    getAsTimeT(tibrvMsg msg,
            const char * field,
            time_t * value)
    {
        tibrvMsgDateTime d;
        tibrv_status err;
        err = tibrvMsg_GetDateTime(msg, field, &d);
        if( err != TIBRV_OK )
            return err;
        if( d.sec > INT_MAX || d.sec < INT_MIN )
            return TIBRV_CONVERSION_FAILED;
        *value = (time_t) d.sec;
        return TIBRV_OK;
    }

## See Also

Validity of Data Extracted From Messages

Field Names and Field Identifiers

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