The only deadline I set are for customers. That is either internal customer because they asked can it be done by x day and I either answered yes or no. Or an external customer because I got on a phone call or someone in sales/support indicated an opportunity or at risk customer.

Ok fine and sometimes I set deadlines because I’m like OMFG how have we not done this yet. Let’s get it done by x day. For example upgrading framework x to latest version y