I spoke to callcenter person. He told me that this bug is related to time zone.
I tried that.
If you change the timezone of computer to the last option (Not Mumbai/Delhi/Kolkatta). Change it to Kritimati Island , this is the last option in settings of control panel in your computer. Time zone UTC + 14:00 hrs.
By doing this your DOF in HUF becomes 29 Dec 0001. I tried various other zones, mostily all are 30 Dec 0001.
You can check that after loggin in the ITR portal and in profile , update, search for compare with pan card. You will get the two different DOI. After changing the time zone come back here, you may see a day difference. It seems a programming error by Infosys for calculating timezone. Any why they need to check timezone?
I have 2 HUF pending for filing return and I am tired. The due date is 20 days now and it seems no one understands this issue. Have submitted many grieviences but no reply yet.