create dates based on columns

[hk2013]

ID	MON18_01	MON18_02	MON18_03	MON18_04	MON18_05	MON18_06	MON18_07	MON18_08	MON18_09	MON18_10	MON18_11	MON18_12	MON19_01	MON19_02	MON19_03	MON19_04	MON19_05	MON19_06	MON19_07	MON19_08	MON19_09	MON19_10	MON19_11	MON19_12	MON20_01	MON20_02	MON20_03	MON20_04	MON20_05	MON20_06	MON20_07	MON20_08	enroll1	disenroll1	enroll2	disenroll2 	enroll3	disenroll3 
111111111	1	0	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	1	1	1	Jan-18	Feb-18	Mar-18	Oct-19	Jun-20	.
222222222	1	1	1	1	1	1	0	0	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	Jan-18	Jul-18	Sep-18	.		
3333333333	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	Jan-18	.				

I am trying to add dates based on columns MON18_01  represents January 2018 etc.. 

i need to add columns enroll and disenroll (enroll1 , disenroll1 , enroll2 , disenroll2 ,.....) 

for data below id 1111111 enroll1 = jan 2018 and disenroll1 = feb 2018 , enroll2 = mar- 2018  disenroll2 = oct 2019 , enroll3 = jun 2020 and disenroll = '   ' 

I need to do that for all the IDs being able to find the zeros and ones and assign enrollment and dis-enrollment dates based on columns  

sample data file attached 

[PaigeMiller]

Most of us will not download Microsoft Office attachments as they can be a security threat. Better you should provide the data as SAS data step code (via these instructions: https://blogs.sas.com/content/sastraining/2016/03/11/jedi-sas-tricks-data-to-data-step-macro/)

I think it would also help if you showed us what the output would look like.

[Astounding]

Are you able to re-shape your data?  The answer to this (and many other) programming problems would be simple to get if your data looked more like this:

ID   YEAR   MONTH  ENROLLED

You would need many observations per ID.  If you were to do this, the programming techniques you would need to learn to process your data would be much more useful to you in future projects.