Quarterly Cron Expression

Example:
0 0 1 1,4,7,10 * /usr/bin/quarterly-report.py
Use 0 0 1 1,4,7,10 * to run on the first day of each quarter.
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FAQs

What are the quarters?

Q1=Jan-Mar, Q2=Apr-Jun, Q3=Jul-Sep, Q4=Oct-Dec.