How to avoid the fail answer "Thu Jan 01 00:00:00 1970" from AT+CIPSNTPCFG

[Breixo]

Hi to all,
I have three NTP servers, "time.google.com","es.pool.ntp.org","hora.roa.es" and I use them to get the date and time and I have two problems:
1. Sometimes I get the data "Thu Jan 01 00:00:00 1970" and I have to repeat the process.
2. I don't know if with the command "AT+CIPSNTPCFG" there is some parameter that in case of the previous error, can be directed to the next NTP Server.
Anyway, any suggestion will be appreciated.
Thank you for your time and attention.