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awk -v today=$(date +'%Y.%m.%d') '$0 == today,!NF {next} {print}'

Success #stdin #stdout 0s 4392KB

stdin

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abc
2017.01.01
not a block
not a block

not a block
2017.12.15
block
block
block
  
end

stdout

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abc
2017.01.01
not a block
not a block

not a block
end

https://ideone.com/6XFfXW

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