Is time() a good salt?

Question

I\'m looking at some code that I have not written myself. The code tries to hash a password with SHA512 and uses just time() as the salt. Is time()

Answer 1

No! Never use the current time as the salt. You can use something like 'SecureRandom' in java to generate a random salt that is secure. Always use an unpredictable random number as the salt.
Using time as the salt will help you to remove collisions only upto a certain extent(because two users can sypply the same passwords at the same time), but still make the passwords recoverable.