If you're already employed at the company they know what you can do, so it's actually not that hard in many places to reduce hours.
If you're looking for a new job you basically need to:
1. Get the right vibe from the company during initial interviews.
2. Be really desirable as a candidate.
3. Only bring it up after you have an offer and it's clear they really want you.
4. Emphasize how when you work you really work.
And as others said, having a good excuse helps. "I want to spend more time with my child" is mine, and it's true, and why I worked 27 hours/week in the past and 35/hours now.
If you're already employed at the company they know what you can do, so it's actually not that hard in many places to reduce hours.
If you're looking for a new job you basically need to: 1. Get the right vibe from the company during initial interviews. 2. Be really desirable as a candidate. 3. Only bring it up after you have an offer and it's clear they really want you. 4. Emphasize how when you work you really work.
And as others said, having a good excuse helps. "I want to spend more time with my child" is mine, and it's true, and why I worked 27 hours/week in the past and 35/hours now.