topic Date format to SAS date trouble in SAS Programming

Date format to SAS date trouble

MerAgSo — Mon, 18 Jul 2022 18:07:41 GMT

Hello everyone,

I am having a little bit of trouble with some dates. I uploaded an excel and imported it to a SAS database with dates in format dd/mm/yyyy. I used the following code to change it to SAS date but I get missings in return. I have tried DATE9. and DDMMYY10.

Here is the code:

data dates;
set previous;
admdate=input(adm, DDMMYY8.);
format admdate;

run;

Thank you

Re: Date format to SAS date trouble

PaigeMiller — Mon, 18 Jul 2022 18:24:44 GMT

Show us the unformatted values of ADM in your SAS data set named PREVIOUS.

Re: Date format to SAS date trouble

pink_poodle — Mon, 18 Jul 2022 18:32:59 GMT

They are already a SAS date. You can just format admdate date9., and that should change the display.

Re: Date format to SAS date trouble

Tom — Mon, 18 Jul 2022 18:35:44 GMT

Before changing anything check what type of variable you have in the SAS dataset first.

Is it numeric or character?
- If numeric does it have a format attached to it?
  - Is it a date type format? Like DATE, DDMMYY, MMDDYY, YYMMDD, etc?
    - If so then there is nothing to do as you already have date values. You could use a FORMAT statement to attach a different format so they dates are displayed differently.
  - No. What do the values look like? Look at some of them? Are they number like 13,052,022 that a human might think of as a date in DDMMYYYY style?
    - If so then first convert them to a string and then back to a date. input(put(ADM,Z8.),ddmmyy8.)
- If character then what do the values look like.
  - Are they strings like '13052022' that a human might recognize as a date in DDMMYYYY style?
    - If so then your code should have worked. Not your code will NOT work if the variable is numeric.
  - Are the strings strange digit strings that look like '44760'?
    - If so then they are the raw numbers that EXCEL uses as dates converted into digit strings. That happens when the column has some cells with dates and others with strings.
      - Convert them to a number and correct for difference in how SAS and Excel count days. input(adm,32.)+'30DEC1899'd

Re: Date format to SAS date trouble

MerAgSo — Mon, 18 Jul 2022 19:22:45 GMT

It is in numeric format and in DDMMYYYY10.

The thing is that I want to change it to SAS date format.

Thank you

Re: Date format to SAS date trouble

Tom — Mon, 18 Jul 2022 19:32:23 GMT

A FORMAT in SAS is instructions for how to display values as text. If the variable is numeric then you have numeric values in the variable.

Since the variable is numeric already you can replace the existing number with the date value and then just attach the format you want to use to display it.

So if you have a dataset named HAVE with a numeric variable named DATE with values like 13,102,021 and 01,051,989 then you can use a step like this to create a new dataset named WANT that has the numbers converted into dates that will display by default as string in MM/DD/YYYY pattern.

data want;
  set have;
  date=input(put(date,z8.),mmddyy8.);
  format date mmddyy10.;
run;

Re: Date format to SAS date trouble

Tom — Mon, 18 Jul 2022 19:43:32 GMT

@MerAgSo wrote:

It is in numeric format and in DDMMYYYY10.

The thing is that I want to change it to SAS date format.

Thank you

There is no SAS format named DDMMYYYY. There is one named DDMMYY and others with a 7th letter to indicate the type of separator to use between the day month and year values.

And what does the 10 mean there? If you have a series of digits in DDMMYYYY style the longest it can be is 8 characters. The only reason you would need 10 is to have room for the delimiter. But there is no place to store a delimiter in a numeric variable.

Did you just mean that the digits of the number look like they could be the day,month and year of a date value? Then convert the number to a string and then back to a date value using PUT() and INPUT() functions.

date=input(put(date,z8.),ddmmyy8.);

And if you mean that the variable is numeric and has the DDMMYY format attached to it already then you already have date values. So what is it you want to change? Do you want to display the values in a different way? Then use a FORMAT statement to attach a different format to the variable.

Re: Date format to SAS date trouble

MerAgSo — Mon, 18 Jul 2022 20:15:42 GMT

Sorry, the format is DDMMYY10. considering separators (/). I know this a date format but I want the numeric value given for SAS date value (The numeric value which counts days from January 1st, 1960). I need this in order to estimate several day differences among dates.

Re: Date format to SAS date trouble

Tom — Mon, 18 Jul 2022 20:26:39 GMT

@MerAgSo wrote:

Sorry, the format is DDMMYY10. considering separators (/). I know this a date format but I want the numeric value given for SAS date value (The numeric value which counts days from January 1st, 1960). I need this in order to estimate several day differences among dates.

It is the number of days already. To get the difference in days between two dates just subtract.

days_since = date2 - date1 ;
days_since_1960 = date ;
days_since_2000 = date - '01JAN2000'd ;