I never heard a tool that you can send bitcoin to a specific time but I tried to check some features from coinb.in.
You can find a tool called LockTime when making a transaction in advanced options. You can check it from here
https://coinb.in/#newTransactionAccording to this
A specified locktime indicates that the transaction is only valid at the given blockheight or later.
Since the locktime field indicated is 419382 and currently the latest blockheight as of 12th July 2016 1108 (AEST) is 420352 the transaction is now valid and can be included in a block by any miner that chooses to do so.
Source:
https://bitcoin.stackexchange.com/questions/46495/what-does-lock-time-meanYou can set the locktime to the blockheight you want the transaction to be included on the block.
So if you can put the locktime higher than the current blockheight your transaction is lock until the blockheight reaches the specific locktime you set.
It looks like there is no exact time or the specific time when will the transaction is being sent.