compute days_passed = datediff(start_date,entry_date,'days'). Compute days before start of data analysis. Add start_date as January 20th., 2015 as new variable to data. I'll just create a new date variable (or -rather- constant) holding this date and subtract it from entry_date. So say I want to know how many days before 20 January 2015 patients entered the hospital. SPSS DATE.DMY creates a date from its components
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