Either you need to update your clock, or everyone does. This can be caused because of clock drifting, or some other issues. Please sync your computer with an NTP server to be sure your clock is right: Google have a huge NTP server and a nice tutorial here https://developers.google.com/time/guides




All softwares that tries to manage a criptocurrency portfolio have some sort of way to export private keys. Multibit, for example, have this tutorial:
https://multibit.org/help/v0.5/help_exportingPrivateKeys.html

Access to a wallet.dat is not necessary, as you can import these private keys to any other compatible software. The lack of technical skills, however, can really be a problem for some people: But the wallet technology is quickly getting easier to use. We already have some wallets that you just need to write down some words instead of exporting keys, for example.


Please do not copy files from other coins inside the CLAM client. They are different, and are not compatible between them. If you need to update your CLAM client, please let it update by itself or use a bootstrap.dat made by dooglus.