Inserting "Second" along with Hour:Minute

[Kal_Lam]

Welcome to the community, @urstpkobo050611! This post discussed previously should help you solve your issue:

Is there any "time" type data format?

Sorry, @Jeff, here is the correct constraint code (thanks @wroos for pointing this out): regex( . , '^(\d*:?\d+:\d\d)$' ) (also corrected above)