convert birthdate to iso8601 format for character variable

[sas1018]

hi

I have a birth variable in a dataset which is character type. Now I want to convert into is8601da. format. First I created another variable to change the birth variable to numeric and then use the put function to apply the format. I have tried the below code:

birth1=input(birth,anydtdtm20.);
BRTHDTC=put(birth1,is8601da.);

birth variable format in the dataset ::::1988-08-29

I got  ********** this for BRTHDTC. What am I doing wrong? Can anybody help me with this.

TIA.

[PaigeMiller]

data have;
    birth='1988-08-29';
	birth_numeric=input(birth,anydtdte.);
	format birth_numeric is8601da.;
run;

You can't use informat anydtdtm. because that expects date/time values, and you have only a date value, so you need informat anydtdte. 

[ballardw]

Here is a useful reference regarding dates, times and datetimes in SAS.

https://communities.sas.com/t5/SAS-Communities-Library/Working-with-Dates-and-Times-in-SAS-Tutorial/... has a PDF with much information about dates.