Hi Vorawooth Quang,<br>
<br>
in arithmetic expressions in the workflow designer you can use the DatePart function explained here: <a href="https://learn.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.dateandtime.datepart">DateAndTime.DatePart Method</a>.<br>
For a list of all available functions, please see the Knowledge center <a href="https://help.docuware.com/#/home/64352/2/2">here</a>.<br>
<br>
Hope that helps.<br>
<br>
Greetings from Germany,<br>
Simon H. Hellmann<br>
DocuWare System Consultant