How do I change the day on a Citizen watch?

Search for this question and the first page is a wall of near-identical "7+ Ways to Change Date on Citizen Eco-Drive" articles. They sit on unrelated university and association subdomains. The extracts shown in search get the directions backwards: clockwise for the date, counterclockwise for the day, and a no-set window ending at 3 a.m. Citizen's own manuals say the reverse. We read eight Citizen instruction manuals and set out below what each one prints, caliber by caliber.

First, two words that people mix up. The day is the day of the week, the short word in the window, such as MON or TUE. The date is the number of the day in the month, 1 to 31. A day-date watch shows both. Most Citizens set both with the crown, the knob on the side of the case. The crown has a pushed-in running position and one or two pulled-out positions. Each pulled-out stop is called a click. On a day-date Citizen, the first click is the calendar position, which other makers call the quickset. The second click sets the hands.

A worked example: one day-date Eco-Drive

Take a day-date Eco-Drive covered by Citizen's E100 manual. Suppose it is Tuesday the 3rd, the hands read 7:40 p.m., and the windows show MON and 2. Here is how the manual's steps play out.

1. Check the hands. 7:40 p.m. is before 9:00 p.m., so the calendar is safe to set.
2. If the crown screws down, unscrew it first. The manual says to "lift up the crown to loosen it before operation".
3. Pull the crown to the first click, the calendar position.
4. Turn the crown counterclockwise. The date steps from 2 to 3. One step is enough.
5. Turn the crown clockwise. The day steps from MON to TUE.
6. Push the crown back in, and screw it down if it screws.

Now suppose the hands read 10:15 p.m. instead. That is inside the window, and the manual says the calendar "may not change correctly" if you set it then. You can wait until morning. Or pull the crown to the second click, turn the hands back to about 8:00 p.m., set the calendar at the first click, then set the time again. Turning the hands back is safe on a Citizen, and its quartz manuals tell you to do it; our answer on turning watch hands backwards quotes them.

Which way to turn, by caliber

Find the caliber on the case back. Citizen's automatic manual says the first four characters of the case number are "the movement number of the watch". Each row below comes from that caliber's own manual.

The rule most people want is in the first three rows. On a crown-set Citizen day-date, clockwise is the day and counterclockwise is the date. That holds for the solar quartz E168 and E100 and for the mechanical 82 series alike.

The fifth row is the trap. Citizen's 901 series automatic shows the date only, and its manual says to "turn the crown to the right (clockwise) to set the date to one day before the date you want to set". So "counterclockwise is the date" is not true of every Citizen. It is true of the day-date ones we read.

Why so many pages give the wrong direction

The listicles that rank for this question say the same thing in slightly different words. Rotate clockwise for the date, and counterclockwise "often" adjusts the day. None of the extracts names a caliber. It is the reverse of every Citizen day-date manual we read.

The guess also misses a clue in Citizen's own wording. On date-only Eco-Drive models, the E168 manual says that "turning the crown clockwise will result in the loose play of the crown". The E365 manual says "Clockwise rotation moves nothing." In other words, clockwise is the day direction, and on a watch with no day it has nothing to drive. If clockwise did nothing on your watch, it is probably a date-only model and the crown is fine.

Seiko owners meet the same confusion from the other side. On the Seiko 4R36 the day is also clockwise, but on the older 7S26 it is counterclockwise. Our answer on changing the day language on a Seiko sets out seven Seiko calibers the same way as this table.

The two-language day wheel

Many day-date watches print each day twice, once in English and once in a second language. This is a bilingual day wheel. Citizen's manual for its 82, 83 and 41 series automatics lists "Bilingual day display" as a feature on some models. It explains how to choose: "The day is alternately displayed in two languages. Once the day has been set to the desired language, the watch automatically displays it after that."

So each clockwise click moves half a day. Click once and MON in English becomes MON in the other language. Click again and you reach TUE in English. Stop on the language you want. Overnight, as the day changes, the other language may show for a while; the Seiko answer linked above explains why, from the patent behind the mechanism.

Citizens that do not set the day at the first click

Some Citizens keep the calendar in their electronics, not on a wheel turned by the crown. On these, the first click does something else. On the E650 it selects a city: "Rotate the crown to select the city". On the E870 it switches modes. Turning the crown at the first click will not move the day.

Radio-controlled models (E650, H800). These pick up a time signal from a radio station and set themselves. The H800 manual says it "automatically corrects the time and date", and the E650 manual says it "automatically adjusts the time and date". You only set the calendar by hand "when the watch cannot receive the time signal", in the H800 manual's words. On the H800 you pull the crown to the first click, hold button B for two seconds or more, then pull to the second click. Each press of B then moves through time, date, day of the week, and year and month. Turn the crown to change each one. While you set the day, a hand points to it on the dial; there is no day window. Whether yours can get a signal at all is the subject of our answer on whether an atomic watch works where you live.

On the E650 you pull the crown to the second click and press button A. Each press moves on: the time, then the date, then the month and leap year, then the day of the week. The ninth step in the manual is "Rotate the crown to adjust the day of the week." Then you push the crown home.

Perpetual calendar models (E870). A perpetual calendar knows how long each month is, so it does not need a fix at the end of a short month. On the E870 you pull the crown to the first click and turn it to the calendar mode, marked CAL. Then pull to the second click and press button A to move from year to month to date to day. In day mode, "Turning the crown to the right changes the day in the order of SUN → MON → TUE", and turning it left goes backwards. Our guide to annual and perpetual calendars explains how these differ from an ordinary date.

None of these three manuals prints a no-set window like the crown-set models have. They do print their own order of steps, and the order matters. Follow the manual for your caliber.

The hours not to set it

A crown-set calendar does not change in an instant. Citizen's automatic manual says the "Day changes a little later than the change of the date." The no-set hours cover the time when the change is under way, and turning the crown then is what the manuals warn against. Our answer on when it is unsafe to change the date explains what is happening inside during those hours.

Citizen's manuals do not all print the same window. The E168 and E100 give 9:00 pm to 1:00 am for date models and 9:00 pm to 4:00 am for day-date models. The 82 series automatic gives 9:00 PM to 4:30 AM for date and day, and says setting then "may prevent the date from changing on the following day". The 901 series gives 8:00 PM to 2:00 AM. The window from 8:00 p.m. to 4:30 a.m. covers every one of them. If you do not know your caliber, keep the hands out of it.

The window counts by the hands, not by the clock on your wall. If the watch is twelve hours out, 10:00 a.m. on your phone may be 10:00 p.m. to the watch. Citizen's automatic manual gives the check: "Change of date indication shows it just became AM." Run the hands forward at the second click until the date changes, and you know you are in the morning half. If the date already jams, see our page on a date that is not changing at midnight.

The date at the end of a short month

Citizen's E365, 82 series and 901 series manuals all count every month as 31 days. The E365 manual says its date "is based on the 31-day calendar". So after a 30-day month, and after February, you set the date by hand. Each manual names the first days of March, May, July, October and December. The day of the week is not affected, since every week has seven days whatever the month.

When this answer stops applying

The table covers eight Citizen manuals read on 3 November 2026. Citizen makes many more calibers, and some will differ. The caliber number on your case back, and Citizen's manual for it, beat this page. A chronograph, a GMT or a world time Citizen may use the crown and buttons in another order, so do not assume the first-click rule. If the crown will not pull out, or does nothing at any click, that is a fault, not a setting problem; our page on a stuck watch crown covers it. If a screw-down crown will not seal after setting, stop turning and see a watchmaker, since water resistance depends on it. And this page does not cover the date on a Citizen sold under another brand name, or a Miyota movement fitted by another maker: those follow their own manuals.

For the rest of the Eco-Drive story, including how long a solar watch takes to charge, see our page on Citizen's Eco-Drive movements and our assessment of the Citizen brand.