Match Date And Paste Certain Value If Not Write -9999

I have to range of dates, one for instance the regular year and the second one, the same year but with some gaps and data going along with. I am looking for a function that will take each date from the full year and searh for the same date in the range with a gaps and then take its coresponding vvalue if that date exists, if not it should write -9999.

so my date are as follows:

regular year
result should be like this here
year with gaps
values of years with gaps

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