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cast(date as date)

Same date value

cast(timestamp as date)

The year/month/day of the timestamp is determined, based on the local timezone, and returned as a date value.

cast(string as date)

If the string is in the form 'YYYY-MM-DD', then a date value corresponding to that year/month/day is returned. If the string value does not match this formate, then NULL is returned.

cast(date as timestamp)

A timestamp value is generated corresponding to midnight of the year/month/day of the date value, based on the local timezone.

cast(date as string)

The year/month/day represented by the Date is formatted as a string in the form 'YYYY-MM-DD'.