Apex domains cannot have CNAME records.
Question and response
Question
dig valentinotime.com. NS
Answer
valentinotime.com. 5 NS ns-1311.awsdns-35.org.
valentinotime.com. 5 NS ns-19.awsdns-02.com.
valentinotime.com. 5 NS ns-126.awsdns-15.com.
valentinotime.com. 5 NS ns-506.awsdns-63.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0