public Task <bool> ExpireAtAsync(string key, int timestamp) => MultiAsync(KeyCommands.ExpireAt(key, timestamp));
 public Task <bool> ExpireAtAsync(string key, DateTime expirationDate) => MultiAsync(KeyCommands.ExpireAt(key, expirationDate.GetUnixTime() / 1000));
 public bool ExpireAt(string key, long timestamp) => Multi(KeyCommands.ExpireAt(key, timestamp));
 public bool ExpireAt(string key, DateTime expirationDate) => Multi(KeyCommands.ExpireAt(key, expirationDate.GetUnixTime() / 1000));