Can solidity wait?

sherry_nictasherry_nicta Member Posts: 3
I am writing a crowdfunding application, and I found this https://github.com/chriseth/cpp-ethereum/wiki/Crowdfunding-example-contract-in-Solidity. I am wondering if solidity supports wait now? So that I don't need to periodically call the contract to check if the crowdfunding expires. Or how can I have the similar feature like the locktime in bitcoin. Many thanks. :)

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