Check this :- 

https://www.odoo.com/forum/help-1/accounting-assets-calculation-depreciations-with-prorata-temporis-issue-164989

Odoo may default the first depreciation entry to the start of the fiscal year or the beginning of the month, which can lead to incorrect depreciation dates.​

To ensure the depreciation entry is dated correctly (e.g., 30/04/2025 for an asset purchased on 24/04/2025), follow these steps:​

1. Manually Set the First Depreciation Date:
   • Navigate to the asset record.
   • Locate the First Depreciation Date field.
   • Manually set this date to the desired depreciation date, such as 30/04/2025.​
2. Recompute the Depreciation Board:
   • After setting the correct First Depreciation Date, click on Compute Depreciation to regenerate the depreciation schedule.​

This approach ensures that the depreciation entry aligns with the intended accounting period.

Thanks & Regards,

Company :- DataInteger Consultancy Services LLP