The promise was clear and hopeful: With strong public health measures, then-President-elect Joe Biden declared in early December, “the majority of our schools can be open by the end of my first 100 days.”

The reality has been far more complicated.

First came the clarification on Biden’s first full day as president, when the administration released a 200-page coronavirus response plan that explained the schools reopening plan included only K-8 schools — not high schools — in those first 100 days.

Then came a walk-back from White House press secretary Jen Psaki, who said the administration’s goal was only to have the majority of schools back in classrooms “at least one day a week.”

And finally came Biden’s walk-back of the walk-back in a CNN town hall, where he described the one-day-a-week standard as a “mistake in the communication,” and said he still expected to be “close” to opening the majority of K-8 schools five days a week by April 30 — the end of his first 100 days in office.