Missed Day count
=(B2-A2+1)-COUNT(C3:C120)
=185
Missing dates
in D3
IFERROR(SMALL(IF(COUNTIF($C$3:$C$121,ROW($42005:$42307))=0,ROW($42005:$42307),""),ROWS($1:1)),"")
Enter with Ctrl+Shift+Enter
42005= 1st jan 2015 (in Excel date)
42307= 30th October
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