Cron Expression 0 0 06,15 * * ? *: Daily Execution at 6:00 AM and 3:00 PM

The cron expression "0 0 06,15 * * ? *" represents the following schedule:

• At 6:00 AM and 3:00 PM every day
• The "?" symbol is used for the day-of-month field, indicating that the expression does not specify a particular day of the month.
• The "*" symbol is used for the month field, indicating that the expression applies to all months.

Therefore, this cron expression will execute the specified task at 6:00 AM and 3:00 PM every day.