Loop for testing different columns

[victor_greffet]

Hi community !

I need your help,

In my script, i'd like to create a test on different type of date, and put a warning when the date is on Christmas or on the first of the year

I have five differents type of dates :

DATA :

ID	Step0	Step1	Step2	Step5	Step9
1	12/12/2017	10/12/2017	10/12/2017	18/12/2017	18/12/2017
2	01/01/2017	10/12/2017	13/12/2017	18/12/2017	18/12/2017
3	12/12/2017	10/12/2017	10/12/2017	25/12/2017	25/12/2017
4	10/12/2017	10/12/2017	18/12/2017	18/12/2017	18/12/2017
...	.....
n	12/12/2017	10/12/2017	10/11/2017	18/12/2017	18/12/2017

What I want :

DATA :

ID	Step0	Step1	Step2	Step5	Step9	Test
1	12/12/2017	10/12/2017	10/12/2017	18/12/2017	18/12/2017	ok
2	01/01/2017	10/12/2017	13/12/2017	18/12/2017	18/12/2017	Warning Step0 it's 01/01
3	12/12/2017	10/12/2017	10/12/2017	25/12/2017	25/12/2017	Warning Step5 it's 25/12 , Warning Step9 it's 01/01
4	10/12/2017	10/12/2017	18/12/2017	18/12/2017	18/12/2017	ok
...	.....
n	12/12/2017	10/12/2017	10/11/2017	18/12/2017	18/12/2017	ok

Do you  have an idea ?

Thank you !

Victor