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Don Burleson Blog 







Oracle Adding Dates

Oracle Database Tips by Donald BurlesonOctober 29, 2015

Question:  I am using MSSQL using the T-SQL DATEADD function to add a duration to an existing date. 

In this example, I am adding a duration expressed in seconds to a existing DATE datatype:

current_end_time := DATEADD(second, current_duration/10, current_start_time)

What is the equivalent of DATEADD for adding Oracle dates?

Answer:  Above you are adding the seconds in your current_duration to an existing date.  Oracle is far more powerful than MSSQL, and there are several ways to replicate this functionality:

  • Write your own DATEADD function.  In Oracle PL/SQL, you can write autonomous functions that become instantly available as any other built-in function.  This makes Oracle infinitely extensible and any TSQL date addition function can be replicated in PL/SQL.
  • Use the add_months function in Oracle, and use simple math to convert the month value to seconds.
  • You can also use the Oracle interval function

See here for more Oracle date arithmetic examples

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