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HTML Guide for time-datetime format

Bad value X for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

datetime
time
time-datetime format

The value used in the datetime attribute is not in a valid format.

The <time> HTML element represents a specific period in time. It may include the datetime attribute to translate dates into machine-readable format, allowing for better search engine results or custom features such as reminders.