No, that is the day-of-week field. From man 5 crontab
Commands are executed by cron(8) when the minute, hour, and month of
year fields match the current time, and when at least one of the two
day fields (day of month, or day of week) match the current time (see
``Note'' below). cron(8) examines cron entries once every minute. The
time and date fields are:
field allowed values
----- --------------
minute 0-59
hour 0-23
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sun, or use names)