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TIBCO Rendezvous® 8.7.0

# Update DateTime

Convenience Function

## Declaration

    tibrv_status tibrvMsg_UpdateDateTime(
       tibrvMsg              message,
       const char*           fieldName,
       const tibrvMsgDateTime*  value);
    tibrv_status tibrvMsg_UpdateDateTimeEx(
       tibrvMsg                message,
       const char*             fieldName,
       const tibrvMsgDateTime*  value,
       tibrv_u16                fieldId);

## Purpose

Update a field containing a datetime value.

## Remarks

This convenience function locates a field (by name or identifier) and updates its data.

The type of the existing field (within the message) and the type of the updating `value` must match.

Pointer data previously extracted from the field remain valid and unchanged until the message is destroyed; that is, even updating the field’s value does not invalidate pointer data. (See Pointer Snapshot.)

Parameter | Description
`message` | Update the specified field of this message.
`fieldName` | Update a field with this name.
`value` | Update the message field to this value. The function copies the new value into the existing field.
`fieldId` | Update the field with this identifier. Zero is a special value that signifies no field identifier. It is illegal to add a field that has both a `NULL` field name, and a non-zero field identifier.

## See Also

Field Names and Field Identifiers

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