date_trunc(week,timestamp) not working in postgresql 7

The following query

select  date_trunc(week,timestamp)

retrieves the start_date of the current week as timestamp ,

2006-10-10 00:00:00

It works in postgresql 8. But fails in postgresql 7.
Let me know the postgresql query which retrieves first date of a week (compatible in both postgresql 7 and 8 versions)
shathyAsked:
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earth man2Connect With a Mentor Commented:
=> select current_timestamp::date - ( 5 + to_number( to_char( current_timestamp, 'D' ),'9' )::int ) % 7;
  ?column?  
------------
 2006-10-30
(1 row)
0
 
shathyAuthor Commented:
The following query

select  date_trunc(week,timestamp)

retrieves the start_date of the current week as timestamp ,

2006-10-10 00:00:00

It works in postgresql 8. But fails in postgresql 7.
Let me know the postgresql query which retrieves first date of a week (compatible in both postgresql 7 and 8 versions)
0
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