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Showing content from https://docs.snowflake.com/en/sql-reference/functions/previous_day below:

PREVIOUS_DAY | Snowflake Documentation

Categories:

Date & time functions

Returns the date of the first specified day of week (DOW) that occurs before the input date.

See also:

LAST_DAY , NEXT_DAY

PREVIOUS_DAY( <date_or_timetamp_expr> , <dow> )

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date_or_timestamp_expr

A date or a timestamp, or an expression that can be evaluated to a date or a timestamp.

dow_string

Specifies the day of week used to calculate the date for the previous day. The value can be a string literal or an expression that returns a string. The string must start with the first two characters (case-insensitive) of the day name:

• su (Sunday)

• mo (Monday)

• tu (Tuesday)

• we (Wednesday)

• th (Thursday)

• fr (Friday)

• sa (Saturday)

Any leading spaces and trailing characters, including spaces, in the string are ignored.

This function returns a value of type DATE, even if date_or_timetamp_expr is a timestamp.

Return the date of the previous Friday that occurred before the current date:

SELECT CURRENT_DATE() AS "Today's Date",
       PREVIOUS_DAY("Today's Date", 'Friday') AS "Previous Friday";

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+--------------+-----------------+
| Today's Date | Previous Friday |
|--------------+-----------------|
| 2025-05-06   | 2025-05-02      |
+--------------+-----------------+

Your output will be different because the example uses the CURRENT_DATE function.

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