डेटाबेस तारीख प्रारूप माइग्रेशन
SQL datetime, Unix timestamp और API date format के बीच schema migration और ETL normalization के लिए परिदृश्य पेज।
Normalized ISO:
-
रूपांतरित करेंed Output:
-
माइग्रेशन चेकलिस्ट
- Freeze source timezone assumptions before any conversion (prefer UTC baseline).
- Build a mapping table for source/target columns and expected output type.
- Run conversion on a sampled slice and compare old/new values by checksum.
- Validate daylight saving boundaries and month-end transitions.
- Roll out in stages with dual-write or shadow-read strategy to avoid silent drift.
-- Example: SQL datetime to unix seconds (MySQL)
UPDATE events
SET created_at_unix = UNIX_TIMESTAMP(created_at_datetime)
WHERE created_at_unix IS NULL;
-- Example: verify spot checks
SELECT id, created_at_datetime, created_at_unix
FROM events
ORDER BY id DESC
LIMIT 20;संबंधित टूल: Date रूपांतरित करेंer, बैच एपॉक कन्वर्टर, कार्य दिवस कैलकुलेटर
सामान्य प्रश्न
What is the safest way to migrate datetime columns?
Normalize to UTC first, migrate with deterministic functions, and verify with sampled diff checks.
How do I avoid timezone drift after migration?
Store canonical UTC values and localize only at presentation layer.
Can I migrate from SQL datetime to Unix timestamp?
Yes. Use database conversion functions and validate edge cases around DST and leap periods.