SAS dates - adding '0's in front of numbers<=9

deleted_user — Fri, 14 Mar 2008 16:40:20 GMT

Hello,
I have really messy data where I have a date variable and it looks like the following:

2/5/04
11/25/06
5/17/03
...etc.

I'd like to make it consistent by adding '0's in front of the single digits..so I'd like to make it look like:

02/05/04
...
05/17/03
...etc.

How do I do this in SAS?

Thanks!!!

Re: SAS dates - adding '0's in front of numbers<=9

Cynthia_sas — Thu, 20 Mar 2008 17:34:14 GMT

Hi:
Is your date variable a character variable or a numeric variable?

The method you use to show leading zeroes in the month or the year will depend on whether you're dealing with a character variable value or a numeric variable value.

Let's assume that your date variable is a numeric variable -- that means that SAS stores the first value not as "2/5/04" but as 16106 -- which represents the number of days between Feb 5, 2004 and Jan 1, 1960 (the SAS zero date). In this instance, a simple FORMAT statement in your PROC PRINT or your procedure would display the date variable's values with leading zeroes.

On the other hand, if your variable is a character variable, then a FORMAT statement will not work to alter the display of your data values. By far, I think the FORMAT statement method -- is the EASIEST way to handle the display of date variable values. But, that means the you must transform your character date variable into a numeric variable -- that is internally stored as the number of days either before or after Jan 1, 1960. If you are READING raw data into SAS format, then when you read '2/5/04', it is possible, on your INPUT statement, to tell SAS to read the messy number and turn it into a numeric date variable. If you already have messy data and the variable is a character variable, then you can transform it with the INPUT function.

See the program below for an example of both the INPUT statement and the INPUT function.

cynthia
[pre]
** Program;

data messy;
infile datalines;
input datevar : mmddyy8. chardate $8.;
return;
datalines;
2/5/04 2/5/04
11/25/06 11/25/06
5/17/03 5/17/03
11/15/50 11/15/50
;
run;

proc contents data=messy;
title '1) What are my variables like';
run;

proc print data=messy;
title '2) No format -- see internal value';
run;

proc print data=messy;
title '3) MMDDYY8 format';
format datevar mmddyy8.;
run;

data fixdate;
set messy;
newdate = input(chardate,mmddyy8.);
run;

proc contents data=fixdate;
title '4) Is NEWDATE variable character or numeric';
run;

proc print data=fixdate;
title '5) CHARDATE variable turned into numeric variable NEWDATE';
format datevar newdate mmddyy8.;
run;

[/pre]

Output:
[pre]
1) What are my variables like

The CONTENTS Procedure

Data Set Name WORK.MESSY Observations 4
Member Type DATA Variables 2
Engine V9 Indexes 0
Created Thursday, March 20, 2008 11:22:45 AM Observation Length 16
Last Modified Thursday, March 20, 2008 11:22:45 AM Deleted Observations 0
Protection Compressed NO
Data Set Type Sorted NO
Label
Data Representation WINDOWS_32
Encoding wlatin1 Western (Windows)

Engine/Host Dependent Information

Data Set Page Size 4096
Number of Data Set Pages 1
First Data Page 1
Max Obs per Page 252
Obs in First Data Page 4
Number of Data Set Repairs 0
File Name C:\DOCUME~1\sasczz\LOCALS~1\Temp\SAS Temporary Files\_TD2592\messy.sas7bdat
Release Created 9.0101M3
Host Created XP_PRO

Alphabetic List of Variables and Attributes

# Variable Type Len

2 chardate Char 8
1 datevar Num 8

***************************************************

2) No format -- see internal value

Obs datevar chardate

1 16106 2/5/04
2 17130 11/25/06
3 15842 5/17/03
4 -3334 11/15/50

***************************************************

3) MMDDYY8 format

Obs datevar chardate

1 02/05/04 2/5/04
2 11/25/06 11/25/06
3 05/17/03 5/17/03
4 11/15/50 11/15/50

***************************************************

4) Is NEWDATE variable character or numeric

The CONTENTS Procedure

Data Set Name WORK.FIXDATE Observations 4
Member Type DATA Variables 3
Engine V9 Indexes 0
Created Thursday, March 20, 2008 11:22:45 AM Observation Length 24
Last Modified Thursday, March 20, 2008 11:22:45 AM Deleted Observations 0
Protection Compressed NO
Data Set Type Sorted NO
Label
Data Representation WINDOWS_32
Encoding wlatin1 Western (Windows)

Engine/Host Dependent Information

Data Set Page Size 4096
Number of Data Set Pages 1
First Data Page 1
Max Obs per Page 168
Obs in First Data Page 4
Number of Data Set Repairs 0
File Name C:\DOCUME~1\sasczz\LOCALS~1\Temp\SAS Temporary Files\_TD2592\fixdate.sas7bdat
Release Created 9.0101M3
Host Created XP_PRO

Alphabetic List of Variables and Attributes

# Variable Type Len

2 chardate Char 8
1 datevar Num 8
3 newdate Num 8

***************************************************

5) CHARDATE variable turned into numeric variable NEWDATE

Obs datevar chardate newdate

1 02/05/04 2/5/04 02/05/04
2 11/25/06 11/25/06 11/25/06
3 05/17/03 5/17/03 05/17/03
4 11/15/50 11/15/50 11/15/50
[/pre]

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SAS dates - adding '0's in front of numbers<=9

Re: SAS dates - adding '0's in front of numbers<=9