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Daniel Nashed


Finding the time a message was send from the return receipt

Daniel Nashed  17 July 2019 05:16:16

We had an interesting and sort of funny support call this week.

An user got a reply from a service database to confirm his request sent in by mail.

The original message sent was a return receipt. But the sender said that there wasn't any received message, with that subject which could have generated a return receipt.

We checked all the logs for an outgoing previous message, without any luck.

Than I had the idea to check the $REF field of the return receipt to find out the time the original message was send.

The $REF is the UNID of the original document (response doc). The last part of the UNID is the Note part which is actually a TIMEDATE.


The internal representation of a TIMEDATE looks like this:

typedef struct tagTIMEDATE {
 DWORD Innards[2];

You can take the internal binary representation of a TIMEDATE and convert it back to a human readable format.

So I wrote a small C-API routine (appended below) to convert the hex representation of the TIMEDATE and print the timedate.


C1257ACC:004FDD93 = [06.12.2012 15:32:20]

In our case it turned out that the original message was from December 2012 :-).

And the return receipt was generated when the user was cleaning up the mail-file opening a message which had never opened before generating a return receipt.

By the way you can do the same for a replica ID which is actually the TIMEDATE the first instance of a database was created. So you can figure out the creation time of a database.
This can be both helpful in some situations for troubleshooting.

-- Daniel

ConvertUnid2Timedate (char *unid_text)


 TIMEDATE timedate;

 char str[255];

 char *p;

 strcpy (str, unid_text);

 p = strstr (str, ":");

 if (p == NULL) p = strstr (str, ".");

 if (p == NULL)


   AddInLogMessageText("nshsem: invalid timedate!", 0, "");

   return 0;


 *p = '\0';

 timedate.Innards[0] = hex2int(p);

 timedate.Innards[1] = hex2int(str);

 AddInLogMessageText("nshsem: %s = [%z]", 0, unid_text, &timedate);

 return 0;



1Carlos  17.07.2019 9:32:37  Finding the time a message was send from the return receipt

Hello Daniel.

Good trick.

The only drawback is that you have to compile an external program.

In the following url you will find a section named "Trick for Creating API TIMEDATE Structures in LotusScript".

You can have the same approach but using the Domino API.



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