Validate that a date is not older than first of January of last year (last year based on input)

@mai-kel ....try below approach:

1. ctrl_date_customer_date - This is your input from user
2. Add 4 calculated controls:
   1. dt_calc_current_year - using format date function and current year get the year
   2. dt_calc_previous_year - in this function will be "dt_calc_current_year-1"
   3. dt_calc_jan_first_prev_year - use this formula with double quotes "01/01"+dt_calc_previous_year
   4. dt_calc_compare_date - using this formula greaterThanOrEqual(ctrl_date_customer_date, dt_calc_jan_first_prev_year)

Hi @kunalpatel 

Thanks for your response. So I used "&&" instead of "+" that was my first fault.

Meanwhile I was able to calculate the earliest possible date and to format the input date but the comparison doesn't work. :(

Current year: 2019

Last year: 2018

Earliest date: 01.January 2018

Issue date: 10. March 2017

Formular for earliest date:

Formular for Issue date:

Last formular for comparison:

I guess it has something to do with not fitting formats?!?

@mai-kel ....no need to convert the string. In calculated control where you concatenate 01/01 with previous year, store is as string and in other calculated control, simply do the greater than equal to. First option should be your customer date and in second option of that function select named control of the calculated control where you're concatenating the value.

Unfortunately this didn't work. @kunalpatel 

BUT thinking over it again, there is simply no need to concatenate or convert or anything.

Simply use date function to get the year. Substract "1" and you have last year.

So you only need to compare the years, no need to extend by day and month. :)

And that is working beautifully.