If i restart the vmware tools in the guests, the time syncs perfect, but why don't do this automatically?
VMware Tools should sync once a minute, as long as you have periodic time synchronization enabled for these VMs. You can check this with the following command in the guest OS: vmware-toolbox-cmd timesync status
1.- Why the vmware tools not sync correctly the date?
Check to see if periodic time synchronization is enabled. Also make sure that only one time service is being used. You don't want both VMware Tools and NTP fighting to set the clock.
2.- Can I do a vmwre tools restart every night for keep the time sync? this have an other troubles?
You can do this, but I don't like this as a workaround. See next response.
3.- What is best, vmware tools or an ntp service?
VMware recommends using the native time functions of the guest OS - NTP in this case. I would go this route.
4.- According to http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427 why the vmware tools are bad for this reason?
I think the key thing is to pick one method (VMware Tools or NTP) and rely on it. Definitely don't have both trying to do the same job. I prefer to use NTP. Check out http://kb.vmware.com/kb/1189 for how to disable periodic time synchronization, if you want to go this route.