Using milliseconds for a unique ID

[danstori]

Hello, I am following Creating Unique Serial Numbers in Forms — KoboToolbox documentation to create a unique ID, but it seems that ‘now()’ doesn’t show up. See form and preview below. Does anyone know how to fix this? Many thanks in advance!

[Kal_Lam]

Welcome to the community, @danstori! Maybe you could follow this post discussed previously:

Code snip from Unique Serial Numbers doc page is not working as expected

See correct syntax/argument order here ODK XForms Specification “Returns the substring beginning at the specified 0-based start index and extends to the character at end index - 1.” Concerning now(), also check this issue, please. (@Kal_Lam) You may also use uuid() function instead: ODK XForms Specification

[danstori]

Thanks very much for the welcome and the useful help @Kal_Lam ! Very helpful. In the end I went forward with the uuid() function.