Quartz Cron expression :Run every 15 days ie twice in a month

Question

I want to set the scheduler with a quartz cron expression which will trigger every 15 days ,for example 1st and 15th of every month.The 0 15 10 15 * ? is triggering only on

Answer 1

0 0 1,15 * * “At 00:00 on day-of-month 1 and 15.”

0 0 1,15 1 * “At 00:00 on day-of-month 1 and 15 in January.”

0 0 1,15 1 6 “At 00:00 on day-of-month 1 and 15 and on Saturday in January.”