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will some expressions by default only change value once?

Hi, i'm using ssis 2014, vs 2013.  i usually let the sql server assign my pkg start date by selecting getdate() in t-sql and assigning the resultst to a run date var.

i'm always thinking about reducing the number of components on my design pane and wondered today if setting the expression on a user:: var called rundate = the expression getdate() would set it only once even though the real value of getdate() is changing continuously all day?

i dont like combining functionality in the same component.  so i usually have this as a separate execution task.  i dont see a system var that is = start date of the pkg


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