MySQL: Get the datetime field with time part reset to midnight (00:00:00)?

I am trying to query the PurchaseDate datetime column from tmp table along with a custom column that is PurchaseDate column with time as 00:00:00 / midnight:

1996-07-16 20:00:001996-07-16 00:00:00
1996-07-10 21:19:001996-07-10 00:00:00
1996-07-12 22:18:001996-07-12 00:00:00

I wasn’t able to do it using DATEDIFF(). How can I do it in the simplest way?

As suggested, I have tried using date(). However that converts the column type to date and I would like to retain it as a datetime.


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Method 1

Convert to date to truncate the time part, then cast to datetime:

    cast(date(PurchaseDate) as datetime) as StartOfDay
from mytable

See live demo.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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