Date format for tine-tuning AI models

The issue is usually consistency and how the training examples are formatted. Avoid mixing natural language, commas, spaces, and different date styles in the same dataset. Also avoid adding fake exact days if your source data only has month/year. I’d use one clear format everywhere, for example: From 2021-01 to 2021-12 or, if you need exact dates: From 2021-01-01 to 2021-12-01