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Difference between two dates in Postgresql

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Getting the difference between two dates in Postgresql. The difference can be in days, months or years.

For difference in days, months or years pass day, month or year as the first argument

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  1. CREATE OR REPLACE FUNCTION datediff (diffType CHARACTER VARYING(15), date1 DATE, date2 DATE) RETURNS INTEGER AS $$
  2. DECLARE
  3. 	YEAR_CONST CHARACTER VARYING(15) := 'year';
  4. 	MONTH_CONST CHARACTER VARYING(15) := 'month';
  5. 	DAY_CONST CHARACTER VARYING(15) := 'day';
  6.  
  7. 	diffInInterval INTERVAL;
  8. 	diffInDoublePrecision DOUBLE PRECISION := 0;
  9. 	diffInInteger INTEGER := 0;
  10. 	dateTemp DATE;
  11. BEGIN
  12.  
  13. 	diffInInterval := age(date2, date1);
  14.  
  15. 	IF LOWER($1) = LOWER(YEAR_CONST) THEN
  16. 		diffInDoublePrecision := date_part('Year', diffInInterval);
  17. 	ELSEIF LOWER($1) = LOWER(MONTH_CONST) THEN
  18. 		diffInDoublePrecision := (date_part('Year', diffInInterval) * 12) + date_part('Month', diffInInterval);
  19. 	ELSEIF LOWER($1) = LOWER(DAY_CONST) THEN
  20. 		diffInDoublePrecision := endDate - startDate;
  21. 	END IF;
  22.  
  23. 	diffInInteger := CAST(diffInDoublePrecision AS INTEGER);
  24. 	RETURN diffInInteger;
  25. END;
  26. $$ LANGUAGE plpgsql;

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