Hithere
In this case, the husband refuses to change the date of the funeral, a date he did not ask OP if she could attend.
Would you also refuse to change the date to accommodate your dh's needs?
No, personally I would probably reluctantly consider changing the date of the funeral. But, if I had made all the arrangements and told all those attending of the date, I would first ask if my partner could change the date of their work commitment. Arranging the funeral of a close relative is obviously a very emotional process; maybe the OPs husband just couldn't face going through the whole rigmarole again (I am sure I wouldn't). Yes, he should have consulted his wife before setting the date, but he didn't and the damage is done; even though he is 'at fault' I couldn't consider not attending my husband's mother's funeral.