It's not the time that matters, it's the timing. You can't legally (and you should not) force a pregnant woman to come to work.
> There's this horrible idea that sexism doesn't exist in enlightened liberal societies
Not all gender inequality is sexism. There are physical and psychological differences between our genders. Case in point: possibility of dichromacy among males versus potential tetrachromacy among females.
>Not all gender inequality is sexism.
True, just the vast majority of it. But next time women complain that they're being underpaid, do remind them of the lucrative opportunities that await them in the growing field of "People better able to tell the difference between shades of green". I'm sure that'll make them feel better.
And even in Denmark there are days where the mother is not allowed to work for the benefit of the child. And that is a product of biology.