This constraint contains all the possible visit days for calling in at the site (up to 64) to which the time window defined by the Opening times 1 and Closing times 1 constraints applies.
Format: character
These days can be defined one by one (1,4), as integers (1,2, …64) or in date format (14/05/2016 => 17/07/2016).
            
Example:
Opening days 1 = 1,2,5 (or 14/05/2016,15/05/2016,18/05/2016) means that the (re)loading operation can take place on days 1,2 and 5 of the
                  planning (or the 14/05/2016, 15/05/2016 and 18/05/2016) at the times defined by the Opening times 1 and Closing times 1 constraints.
                  Opening days 1 = 1-5 (or 14/05/2016 => 18/05/2016) means that the (re)loading operation can take place on all days 1, 2, 3, 4 and 5 in the planning (or between
                  the 14/05/2016 and the 18/05/2016) at the times defined by the Opening times 1 and Closing times 1 constraints.
               
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                     Warning | 
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                         Caution: this constraint must be put into correspondence with the Worked days constraint for resources and must use the same format (date or number)/ No date under Opening days 1 can be earlier than the oldest date defined under Worked days.  | 
                  

![[Warning]](images/community/docbook/warning.png)
