it seems that the following is better :
1) Assign need a variable name as parameter see documentation.
2) Assign return the affected value => if(,"") erase the returned value
....
expr ( if(assign("totalsec", date.subseconds("20090120120000", date.now)),"")++
totalsec/(24*3600)++":"++totalsec%(24*3600)/3600++":"++totalsec%3600/60++":"++totalsec%60)
hope this help !
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