Is time() a good salt?

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() too simple a salt for this or is this code safe?

Thanks for the answers and comments. I will sum it up here for the new readers:

• salt should be different for each user, so if 2 users register at the same time, their salts won't be unique. This is a problem, but not a big one.
• but salt shouldn't be in any way related to the user, so time() is not a good salt.
• "Use a random, evenly distributed, high entropy salt." -- That's a mouthful, so what code could possibly generate a random, evenly distributed, high entropy salt?

Ok, so how about I replace time() with a random string 32 char long. The random string could be generated from looping 32 times over a set of alphabet chars. Does that sound good?