WASHINGTON—The weekend, a recurring two-day period traditionally scheduled to follow Friday, announced Thursday that it will be arriving two days later than usual, citing what it called “unresolvable scheduling conflicts with Monday.”

“We regret any inconvenience this may cause,” read the statement, issued on weekend letterhead at 4:52 p.m. and distributed to all workers with a standard five-day schedule. “Monday has indicated that it is not in a position to move, and frankly, it was very firm about it. We tried.”

According to the statement, Monday has been “increasingly pushy” about its time slot in recent months, reportedly sending several early-morning reminders and, on at least one occasion, arriving before anyone was ready. The weekend said it ultimately chose to defer rather than “get into it again.”

Under the revised schedule, Friday will be followed directly by Saturday, Sunday, and a second, previously unannounced Monday, with the weekend slotted in sometime after Wednesday. The weekend described the new arrangement as “temporary,” though it declined to say what that meant.

Workers nationwide received the news with the weary calm of people who have been through this before.

“I’m not surprised, honestly,” said Darlene Voskuijlen, 41, who has worked in an office for 19 years and described the weekend as “always sort of overpromising.” “It shows up Friday night like it’s going to be this big thing, and then it’s Sunday afternoon and I’m looking at a calendar. I should have known it had an exit strategy.”

Dr. Halvard Pemberton-Quill, senior fellow in Temporal Obligations at the Institute for the Study of Recurring Dread, said the delay reflected a long-developing power imbalance between the two time periods.

“Monday has been operating from a position of enormous strength for decades,” said Pemberton-Quill, who also chairs the Subcommittee on Sunday-Evening Stomach Sensations. “It has the alarm clocks, the commuter traffic, and a standing 9 a.m. meeting. The weekend has a vague feeling of freedom and, at best, brunch. That’s not a fair fight.”

“I really wanted to be there for everyone. I just can’t do it with Monday breathing down my neck.”

The weekend’s statement closed on a personal note, with the weekend writing that it “truly wanted to be there for everyone” but could not do so “with Monday breathing down my neck.” It thanked workers for their patience and encouraged them to “try to find rest wherever possible, such as in the 20 seconds before opening email.”

Reached for comment, Monday said it was “aware of the situation” and had “nothing to add,” before arriving at its usual time.

At press time, Friday had released a statement distancing itself from the dispute, saying it “only works here” and “is leaving at 5.” Sources confirmed that Thursday, which has been pretending to be Friday since 2009, would continue to do so for the foreseeable future.