4 Steps to Import Fiscal Periods using the Fiscal Calendar Plugin
Fiscal Calendar Plugin (com.snc.fiscal_calendar) gives infrastructure to generate fiscal periods depending upon financial calendar type like Regular, 13 Period or 445.
Special Note: Fiscal periods are generated in User's logged in timezone. Ensure the timezone in your destination instance.
Follow the steps below, if you want to generate fiscal periods in your sandbox instance and you would like to move them to destination instance.
Technical knowledge of ServiceNow Platform administration and Understanding of Project Portfolio management OR Financial Management.
Step 1: Create New Update Set. Generate Fiscal Periods (Fiscal Periods > Generate). And close the update set.
Step 2: Validate Fiscal periods in your sandbox instance. Navigate to Fiscal Periods list > Click "Validate Periods" button. Make sure things are working fine here. If you are using modules like Financial Modeling (formerly known as Cost transparency), Financial Charging, Financial Planning, Cost plans in Project Portfolio Management you can test if things are working as expected. Date filter on platform list is working for fiscal specific filters like "This Fiscal year", "Last Quarter".
Step 3: Export all fiscal periods (through export XML).
https://www.servicenow.com/community/spm-blog/4-steps-to-import-fiscal-periods-using-the-fiscal-calendar/ba-p/2280034