Presidents Day is never on a Tuesday. Labor Day is never on a Wednesday. Martin Luther King Jr. Day never lands on a weekend. This isn’t a pattern that emerged by habit. It’s written into federal law, and the law itself has a more complicated history than most people realize, including one holiday Congress moved and then had to move back. This piece walks through which holidays were legislated onto Mondays, which ones were built that way from the start, and why a handful of dates on the calendar were never touched at all.

It Is Not a Coincidence. It Is a Law

Federal holidays in the United States are defined by statute, specifically 5 U.S.C. § 6103. In 1968, Congress passed the Uniform Monday Holiday Act, Public Law 90-363, which President Lyndon B. Johnson signed on June 28, 1968. It took effect on January 1, 1971. The goal was straightforward: convert several fixed-date holidays into fixed-Monday holidays, guaranteeing federal employees a predictable three-day weekend and giving the travel and retail industries a reliable bump in spending several times a year.

Before the Act, Washington’s Birthday, Memorial Day, and Veterans Day were pinned to specific calendar dates, so they landed on a different day of the week each year, occasionally falling on a Tuesday or Thursday and creating an isolated day off surrounded by two working days. The 1968 law solved that by anchoring the holidays to a Monday instead of a date.

What the 1968 Act Actually Moved

The Act changed four holidays. One of them didn’t stay changed for long, which is covered in the next section.

Note that “Presidents Day” is the popular name. The federal statute still calls it Washington’s Birthday, and it has never officially been renamed, despite decades of retailers and calendars branding it otherwise.

The One Holiday Congress Moved Back

Veterans Day is the exception that shows how far legislated convenience can go before it runs into something people won’t give up. Moving the holiday off November 11 severed it from the date it actually commemorates: the armistice that ended World War I in 1918, the reason the day was first called Armistice Day. Veterans’ organizations objected almost immediately after the change took effect in 1971. By the mid-1970s, most states had either refused to adopt the new October date or had switched back to November 11 on their own.

Congress could legislate a holiday onto a Monday, but it could not legislate away what November 11 meant to the people the holiday was for. worldtimedata

Congress reversed course with Public Law 94-97, signed by President Gerald Ford on September 20, 1975, restoring Veterans Day to a fixed November 11 starting in 1978. It has stayed there since, regardless of what day of the week that turns out to be. Of the four holidays the 1968 Act touched, it’s the only one that isn’t anchored to a Monday today.

The Holidays That Were Born on a Monday

Two of the most familiar Monday holidays were never fixed-date holidays at all, and neither one came from the 1968 Act. Both are common sources of confusion, since people tend to assume every Monday federal holiday traces back to the same law.

Labor Day predates the Uniform Monday Holiday Act by 74 years, and by an odd coincidence, President Grover Cleveland signed it into law on the exact same calendar date, June 28, that Lyndon Johnson would later sign the 1968 Act. It was designed as a Monday holiday from day one, following years of state-level labor movements that had already been celebrating it that way informally.

MLK Day followed a similar path but arrived far later and after a longer fight. President Reagan signed the bill in 1983, fifteen years after the holiday was first proposed in Congress, and the third Monday in January was written into the law from the beginning. It was first observed in 1986. There was never a fixed-date version to move away from.

Why Some Holidays Were Never Touched

The 1968 Act wasn’t shy about its ambitions. An earlier draft of the bill reportedly proposed moving Independence Day itself to the first Monday in July. That provision never made it into the final law. July 4 stayed fixed, and it remains one of the few American holidays where the date is arguably more culturally load-bearing than the day of the week ever could be.

The same logic applies to holidays that were never part of a federal three-day-weekend push in the first place. Christmas stays fixed to December 25 because its date carries centuries of religious and cultural weight that a Monday rule would only complicate. Administrative convenience was the whole point of the 1968 Act, and it only wins out over a fixed date when that date doesn’t already mean something on its own.

A Different Kind of Moving Date

US federal holidays aren’t the only ones that shift from year to year, but they shift for a completely different reason than most of the other moving dates on this site. Holidays that follow lunar or religious calendars move because the underlying calendar itself doesn’t align with the Gregorian year. Federal Monday holidays move for the opposite reason: the Gregorian calendar is fixed, and the law simply defines the holiday by a weekday position within a month instead of a date.

Mother’s Day and Father’s Day use the same weekday-position logic, just anchored to a Sunday instead of a Monday, and neither one is a federal holiday at all. Thanksgiving runs on a related rule, the fourth Thursday in November, which is itself the product of a legislative fix: in 1939, President Roosevelt moved Thanksgiving a week earlier to extend the shopping season before Christmas, causing enough public confusion that Congress permanently fixed it as the fourth Thursday by law in 1941. Black Friday’s date moves for exactly that reason, one legislative fix cascading into another.

Finding the Right Monday

The “third Monday” or “last Monday” rule sounds vague until you break down how it’s actually calculated. It isn’t the third Monday of the year or the third week; it’s the third Monday counting only within that specific month.

“Last Monday” works the same way in reverse: find the final Monday that still falls within the month, which is why Memorial Day can land anywhere between May 25 and May 31 depending on the year.

Why the Weekday Rule Still Matters

Beyond the three-day weekend, the Monday rule has concrete downstream effects. Banks close. Federal offices close. The postal service suspends regular delivery. The NYSE and NASDAQ also close for these dates, and because the holiday always falls on a weekday by design, it reliably interrupts a full trading session rather than landing on a weekend when markets would already be closed anyway. That predictability is precisely what the 1968 Act was built to deliver, just applied well beyond the federal workforce it originally targeted.

The Calendar Is Partly Law, Partly Memory

Most of the Monday holidays Americans take for granted exist because Congress decided, in 1968 and again in 1983, that a predictable day off mattered more than a historically specific date. That calculation held for Washington’s Birthday, Memorial Day, and Columbus Day. It didn’t hold for Veterans Day, where the date itself turned out to be the point. Labor Day and MLK Day were never part of that tradeoff at all; they were built as Monday holidays from the start. What’s left on the calendar is a mix of administrative convenience and dates nobody was willing to move, and knowing which is which explains more about the American calendar than the dates alone ever could.

Sources and references