BitHodl

BitHodl is a bitcoin wallet that makes sure that you hold on to your bitcoins even through the most volatile roller coasters. BitHodl locks your BTC using pay-to-script hashes, making them impossible to spend before a specified date.
Access - Bitcoins stored with BitHodl are stored on the device and only you can access them. No company or third party can access your funds in any way.
Recovery - BitHodl uses a mnemonic seed to generate your wallet. By safely storing this seed, you can recover your wallet in case you would lose or break your phone.
Locking - It is impossible to unlock funds before the specified unlock date. Please act responsibly and don’t lock too much for too long.
BitHodl uses a server to retrieve and submit information to the blockchain. This server does not have any access to your funds in any way. By default this service is provided by BitHodl, but you can host your own service and enter its URL under settings.
BitHodl is free and open-source. You can review its source code on GitHub as well as build and run it yourself: https://github.com/blockfirm