Dates in Title Block

[Anonymous]

So I've made a title block, but for the date section, I want it to display the "Sheet Issue Date" unless there is a revision on that sheet. Then I want it to display the "Current Revision Date" instead. Is there a way to do this? I have tried writing IF statements as shown in the screenshot, but the error "Improper use of boolean expressions" keeps showing up. Any help would be great. Thanks.

[Jerry.jc.Wu]

I believe Revit Conditional Statements is not working properly for null or "", maybe you should try using dynamo for this.

[ToanDN]

Is Sheet Issue Date the same for all sheets?

[Anonymous]

No, it changes per sheet, as does the Current Revision Date. 

[ToanDN]

Try two opaque labels: Current Revision Date on top of Sheet Issue Date.

[andrea_kohl]

Not pretty... but was able to get it to work.

In the sheet index schedule...

Created a Yes/No parameter named _Issue Sheet_. Made it a hidden field in the schedule.

Then created a calculating parameter discipline: common, type: text, with the formula If(Issue Sheet,Sheet Issue Date, Current Revision Date)

This lets me toggle one column of dates per sheet to either display the Sheet Issue Date or the Current Revision Date. Still have to check/uncheck the box manually, but can choose which is shown.

Apologies... I was thinking sheet index schedule when I was searching for ideas and came across your post with the same formula issue, not the title block. I agree with Luke that a visibility parameter works well, but is not automated.

[luke.johnson]

Yeah so basically you could do something similar with an instance or type visibility parameter.