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# Convert Date of Birth to Age, results a negative number

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## Convert Date of Birth to Age, results a negative number

(OP)
Greetings,

I'm able to convert a birthdate to age and all is fine except for years in the early 1900s, 1912 - 1920 for instance.  I need to correct this, what do I need to add to the query string?

All help is greatly appreciated!

Thanks,
JustATheory

### RE: Convert Date of Birth to Age, results a negative number

We're missing at least one important piece of information.
What is your current query string?
What RDBMS are you using.

### RE: Convert Date of Birth to Age, results a negative number

(OP)

Oracle 11g

SELECT ID, DOB, floor((months_between(sysdate, DOB))/12) age FROM table
;

Sample  Results

ID    DOB            AGE
1    25-Aug-54    57
2    10-Feb-85    27
3    20-Sep-80    31
4    10-Aug-18    -7

Many Thanks!

JustATheory

### RE: Convert Date of Birth to Age, results a negative number

Jarl is correct - this is an Oracle question.
But the short answer is you are using an RR date model for years.  In essence, Oracle is rounding off your century, and years below 50 (or is it 51?  I forget) are assumed to be in the current century. So 10-Aug-18 is considered to be 2018, not 1918.

Try this:

#### CODE

SELECT TO_CHAR(dob, 'DD-MON-YYYY') AS real_date FROM table;
and the results of your original query will be clear.

### RE: Convert Date of Birth to Age, results a negative number

(OP)
Thanks to both Jarl and carp,  this works perfectly and I'll check out the oracle 11g forum.

JustATheory

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