Error message

• Warning: date_timezone_set() expects parameter 1 to be DateTime, boolean given in format_date() (line 1938 of /nfs/c10/h01/mnt/145066/domains/itsalif.info/html/includes/common.inc).
• Warning: date_format() expects parameter 1 to be DateTime, boolean given in format_date() (line 1948 of /nfs/c10/h01/mnt/145066/domains/itsalif.info/html/includes/common.inc).