Well this is not easy then, I will leave them as they are but make sure the current fiscal year is 2019. You can delete 2018 for sure.. Take a look at this:

https://frontaccounting.com/punbb/viewtopic.php?id=7319

Good Luck

Thank you for your reply. I have hit the button a few times (didn't know what I was doing) and now I added a few years but i cannot delete them. If I try it will say "Cannot delete this fiscal year because there are fiscal years before." But I don't have any option do delete any of them. Please help......

Fiscal Year Begin    Fiscal Year End    Closed       
1-Jan-2018    31-Dec-2018    Yes       
1-Jan-2019    31-Dec-2019    No       
1-Jan-2020    31-Dec-2020    No       
1-Jan-2021    31-Dec-2021    No

setup-->Fiscal Years
You have to add your 2019 dates of your fiscal years.
Then
setup-->Company Setup
Choose the fiscal year of 2019 and hit UPDATE on the bottom of the screen.

Test if it works for your quotation dates..

Give us some feedback

Quotation and sales date defaulted to 31/Dec/2018

Unable to change the fiscal year to the company tax year.

The quotation validation date is wrong. I have changed in setting to a different number and I realise the days would be 31/Dec/2018 + x days. Today is 03/Jun/2019.

Thanks!