Progressives and migrant advocates have their undies in a twist over City Hall’s utterly legit curfew at four city-funded migrant centers.

Sorry: The same rule is longstanding at regular homeless shelters across the five boroughs — check in each night by 11 p.m. and stay inside ’til 6 a.m. the next morning.

“I think it’s another barrier being put in place for migrants really trying to figure out a way to work, and get out of the shelter system,” fumed Queens Borough President Donovan Richards.

Nope: If you need to go to work, school or a medical appointment, you can get an exception, as in the rest of the shelter system.

But break curfew three times within 30 days, and you can face expulsion: Any right to shelter is limited to acceptable behavior.

Yes, the curfew seems a response to complaints about migrants going door-to-door panhandling at all hours of the day and night, but the real question is: Why it wasn’t imposed from the outset?

Indeed, why isn’t it universal at every city-funded venue, including hotels, housing migrants?

Controlling the chaos is important to keeping track of how many beds are available for new arrivals, and a basic safety measure that protects often-vulnerable migrants, especially children, as well as the neighbors.

And anyone crying of racism, discrimination or stigmatization here is simply showing himself to be obsessed with complaining.