Equivalent of Oracle next_day function

Is there a postgres equivalent of Oracle's next_day() function? We have a
web-based report that lists an employee's hours from Monday (of the current
week) through the following Sunday (or sometimes the same period for the
previous week); the beginning/end dates are retrieved (in Oracle) using the
next_day function, ala:

SELECT TO_CHAR ( ( NEXT_DAY ( SYSDATE, 'MONDAY' ) - 7 ),
'MM/DD/YY' ) AS THEMONDAY FROM DUAL

What would be the simplest way to do this query in PostgreSQL?

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David Rickard
Software Engineer
The GTS Companies
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