Welcome to our latest blog post, “How to Fix the Date on a Watch.” One of the most frustrating things that watch owners can encounter is when the date function on their watch is not functioning correctly.

This issue can cause constant annoyance since it is always visible on the watch’s dial. In this post, we will guide you through the ins and outs of how a calendar works, whether it’s a date-only or a day-date function, or even a moon phase.

By the end of this article, not only will you have a deeper understanding of how these functions work, but you will also learn how to troubleshoot and lubricate them correctly.

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How to Fix the Date Display : Calendar Parts

It’s impossible to know every single calendar system made, but understanding their mechanics is key to working on any system without a technical sheet.

The Hour Wheel

No matter what type of calendar system it is, whether it displays the date, day, moon phases, or sunrise and sunset, they all begin with the hour wheel.

The Hour Wheel drives the Calendar 
 Date system
The Hour Wheel

In lesson four, we learned how the motion works by slowing the rotation of the center wheel to slow it down so that the hour wheel only revolves twice a day. But the train for the calendar works differently, where you’re displaying days and dates.

That train only needs to revolve once a day. We must reduce the two rotations of the hour wheel to only one rotation every 24 hours to change the day and date.

The Intermediate Date Wheel

It’s a very simple design, consisting of a toothed wheel that meshes with the hour wheel and a pinion on the underside that gears with the next part called the driving wheel.

Intermediate Date Wheel turns the driving wheel in a Date Calendar system
Intermediate Date Wheel

The Driving Wheel

The driving wheel’s purpose is to rotate the date indicator once every 24 hours.

Driving Wheels turn the date indicator in a watch calendar system
Driving Wheel

There are different setups for the driving wheel. It could have a fixed pin or a fixed finger attached to it, or like in the Seiko movement, an arm that rotates around and interacts with the teeth on the date indicator.

Date Indicators and Their Parts

These numbered rings can be made of plastic like in the Seiko movement or brass like in the ETA movement, and will have 31 teeth, one for each number to be displayed.

Date Indicator turns to display the date in the dial window of a watch
Date Indicator

The day disc on this Seiko movement has 14 teeth since it displays days in two languages and makes two position changes every 24 hours.

Seiko Day Disk
Seiko Day Disk

The Jumper

The jumper holds the position of the disc or the ring so that it sits correctly in the display window on the dial. Different calendar systems have different ways of doing this. The ETA has a separate jumper for the date indicator, while the Seiko movement has the jumper built into one of the maintaining plates.

ETA Jumper
ETA Jumper
Seiko Date Jumper
Seiko Date Jumper

 Maintaining Plates for the Calendar Works

Finally, to hold everything in place in the calendar works, a way to hold all the parts down is needed.

In the Seiko movement, this is a combination of two plates, one with the built-in jumper and another maintaining plate that has a jumper for the day indicator as well as a built-in wheel that interacts between the winding wheel on the stem in the double corrector.

Eta Maintaining Plates
Eta Maintaining Plates
Seiko Maintaining Plates
Seiko Maintaining Plates

In the ETA movement, there are two plates responsible for holding down the date indicator, but there’s another crucial part that we need to discuss, the double corrector.

The Double Corrector’s Role

The double corrector interacts with the teeth on the date indicator, turning it one position at a time, and is held in place by the jumper.

Double Corrector
Double Corrector

 In the ETA movement, the double corrector has three fingers on the top, which interact with the teeth on the date indicator, turning it one position at a time.

Interaction with the Seiko Movement

In this Seiko movement, the double corrector is activated when the stem is in the second position.

When you turn the stem in one direction, the double corrector interacts with the teeth on the date indicator, turning them one position at a time. When you turn the stem in the other direction, the double corrector shifts over and interacts with the date-changing wheel in the quick set position.

Assembling and lubricating the Seiko Calendar System

Understanding Lubrication in Seiko Movements

The first thing to understand about lubricating Seiko Day/Dates is that most of the plastic parts don’t require any lubrication. It may have something to do with the friction properties between the steel and plastic parts, but even Seiko’s tech sheets don’t call for lubrication at these points.

Assembling the Parts

Starting with the Seiko 7S26, we can begin assembling the parts. First, let’s install the date driving wheel and install the hour wheel adding a touch of HP 1300. Then, we can install the intermediate date wheel and test the function to ensure the teeth mesh together.

Lubricating the Teeth

Next, we can lubricate the date Ring or Wheel. There are a couple of ways to do this, but one effective method is to put a small dab of grease on a finger cot, take a plastic hold-down stick, and turn it in the lubrication to spread it lightly on the stick.

Lubricating Date Disc
Lubricating Date Disc

Then, holding the date ring between your fingers, you can use the stick to rotate it around the teeth and deposit a small amount of grease on the teeth.

Grease Deposited on Teeth
Grease Deposited on Teeth

Installing the Double Corrector and Date Wheel Jumper

After lubricating the date indicator wheel, we can install it onto the movement, followed by the double corrector and the date wheel jumper.

 The date wheel jumper is held in position with a couple of steady pins.

 It’s important to note that trying to put the jumper in position before laying in the date maintaining plate may cause it to kick out the date indicator and make it difficult to assemble the other pieces.

Installing the Jumper

To avoid this, leave the date jumper out of position, lay in the date maintaining plate, and put a couple of screws in just enough to hold the jumper from coming off the steady pins.

Installing Seiko Maintaining Plates
Installing Seiko Maintaining Plates

 Once the two screws are in place, put the jumper in position between the teeth, tighten the screws down, and then install the other two screws.

Checking the Quick Date Change Function

With the date guard in position, we can now check the function of the quick date change. Running it through at least once or twice ensures that it works while spreading the lubrication evenly on all the teeth.

Alternative Method for Lubrication

Another alternative method to lubricate the teeth on a date indicator wheel is to apply a small bit of grease to the tooth itself. You may have to repeat this process for five or six teeth, then lubricate another tooth, and continue until you cover all 31 teeth. Running the quick date change function, a couple more times will spread out the lubrication evenly.

Installing the Date Disc

To install the date disc, start by installing the intermediate wheel, which works with the quick date change function.

Installing Seiko Day Wheel
Installing Seiko Day Wheel

Then, lay the disc in position with the language of your choice at the three o’clock position, exchange the jumper in between the star teeth, and lightly hold it down with a pair of tweezers.

Installing C-Clamp
Installing C-Clamp

Leave the language of your choice again in the three o’clock position, and then install the C-clamp with tweezers. Finally, check the changeover of the date and the day to make sure everything’s functioning properly.

Assembling the ETA 2783 Calendar System

In this section, we’ll be discussing the steps needed to properly assemble the ETA2783.

Starting with the Hour Wheel

To begin, we’ll start with the hour wheel, which will be lubricated as normal. We’ll then apply a very small drop of HB 1300 to the bottom pivot of the date driving wheel and install it into position. We’ll also lubricate the date indicator as we did before and put it in position.

Installing ETA Hr and Driving Wheels
Installing ETA Hr and Driving Wheels

Installing the Date Jumper

Now we need to install the date jumper, which has an independent spring that holds it under tension. To do this, we’ll take the bridge that acts as a hold-down for the date indicator and also covers up the jumper and the jumper spring to hold it in position.

   The intermediate date wheel fits into the C-slot on the bridge. We’ll apply a small amount of HB 1300 to that and install the intermediate date wheel.

Intermediate wheel In Jumper Bridge
Intermediate wheel In Jumper Bridge

Next, we’ll install the jumper in its position and then the spring. However, this spring is very tall and can be tricky to hold down with any kind of steady pin or peg wood.

So, we’ll use a set of pins and find one smaller than the inside of the spring. We can use the pin to steady the spring in its position and gently push the spring into place.

Getting Jumper Spring in Position
Getting Jumper Spring in Position

Once the bridge is in position, insert the screw, and tighten it down.

Installing ETA Maintaining Plate
Installing ETA Maintaining Plate

Checking the Double Corrector’s Function

Once everything is in place, we’ll install our double corrector. With the double corrector installed, we can now install the dial indicator maintaining plate, which is held in by two screws and completes the assembly.

With the Stem in the second position, we can check the double corrector’s function and then pull the stem out to the hand winding position and wind it around to ensure that the date indicator is also working in that position as well.

 Troubleshooting Calendar System Issues

Now that you have a good understanding of how the calendar system works, let’s talk about some common issues you may encounter and how to troubleshoot them

 An issue with Day or Date Display

If you notice that the day or date is not sitting straight in the window of the dial, there could be a few possible causes.

First, check the dial feet under the dial to make sure they are not bent or broken. If the day or date only sits straight on some days and not others, inspect the teeth on either side of the number or day to ensure they are not damaged.

Bent or Missing Dial Feet
Bent or Missing Dial Feet

This issue can also be caused by the jumper having too much slop in the opening. If the day or date is not lining up on all the numbers, look for a bent jumper, such as on the Seiko movement, or a problem with the spring on the ETA movement.

Additionally, make sure all the plates are tightened down properly, as a loose plate that holds down a jumper and a spring can cause faults in the date window.

 Issue with Quick Date Function

If your quick date function is not working, but the date changes normally during the regular running of the movement, the double corrector may be the problem.

Inspect Double Corrector for Wear when trying to fix a date system in a watch
Inspect Double Corrector for Wear

 If the quick date change for the day is not working properly, look at the intermediate wheel and possibly any damage on the star underneath the day disc.

If the day and date are not changing over in the normal course of the watch running, inspect the gear train leading from the hour wheel to the driving wheel.

 Date Doesn’t Turn Over Exactly at Midnight

If you’re experiencing an issue where the date doesn’t turn over exactly at midnight, it’s usually just a matter of taking the hands off and resetting them so that the hands are exactly at 12 midnight when the date changes. I will be creating a hand setting video soon, so stay tuned for that.

Issue After Dial is Installed

If the calendar system is working fine before the dial is put on, but after the dial goes on, it doesn’t work right, it’s likely because there’s a spacer missing that separates the space between the driving wheel and the date disc and the underside of the dial.

If the dial is pushed down directly on top of the disc, it won’t turn correctly. Make sure to put on the movement ring that separates the two pieces.

Clarifying Changing the Time between 9 p.m. and 3 a.m. H3: Understanding the Issue

Let’s clear up some confusion about changing the time between the hours of 9 p.m. and 3 in the morning. To start, it’s essential to follow the manufacturer’s recommendations on that movement regarding date changes between certain hours.

The main reason for the problem has to do with a finger or pin on the driving wheel being fixed.

When a driving wheel is rotating, the pin or the finger is in between two teeth on the date indicator for a period of between four to six hours.

If the finger on the driving wheel is fixed and positioned between two teeth, if you attempt to use the quick date function to turn the date over, the dial indicator will try to turn but hits the resistance of the fixed finger that’s sitting between the two teeth.

Some people even though they feel a bit of resistance, will force the date to turn over, causing damage to various parts of the calendar system.

Safety Features

To prevent such damage, many manufacturers design driving wheels with safety features. For instance, the Seiko movement has a driving finger for the date indicator that, when caught between teeth, gets pushed out of the way by the teeth on the driving wheel because the driving finger can be pushed down.

Seiko's Calendar Safety System
Seiko’s Calendar Safety System

On the other hand, the driving wheel on the ETA movement has a spring-loaded finger. When using the quick date function, the tooth on the driving wheel pushes the spring out of the way as it comes around. These safety systems are designed to prevent damage from occurring.

ETA Calander Safety System
ETA Calendar Safety System

Best Advice

While it’s not a good idea to use the quick date function during these hours, there’s no need to panic. These safety systems are in place for the occasional time you might forget. Therefore, the best advice is to follow the manufacturer’s specifications.

Can I Change the Date on my Watch?

Yes, you can change the date on a watch. Most analog watches have a mechanism that allows you to adjust the date by turning the watch’s crown. The crown is the small knob on the side of the watch that you can pull out to adjust the time or date.

To change the date on a watch, simply pull the crown out to the first position, which is typically the position where you can adjust the date. Then, turn the crown either clockwise or counterclockwise until you reach the desired date. Make sure to set the date to the correct day of the month, as some months have fewer days than others. Once you have set the date, push the crown back in to its original position.

Note that some watches have a specific time period during which the date can be changed. For example, some watches have a “quickset” function that allows you to change the date quickly and easily by turning the crown in a specific way. Be sure to consult your watch’s manual or contact the manufacturer for specific instructions on how to change the date on your watch.

When should you not change the date on a watch?

Do you know when it’s best to hold off on changing the date on your watch? Let’s dive in and explore some possible situations:

Firstly, if you find yourself between the hours of 9 pm and 1 am, it’s best to avoid changing the date. Most watches with a date function go through a process of changing the date over this period. Changing the date during this time could result in damage to the watch’s internal mechanism, so it’s best to hold off.

Another situation to watch out for is when the watch’s crown isn’t fully pushed in. Attempting to change the date when the crown isn’t pushed in can cause damage to the internal mechanism, including the date function. Make sure to double-check that the crown is fully pushed in before attempting to change the date.

If your watch isn’t water-resistant, it’s best to avoid changing the date when it’s exposed to water. Water can cause damage to the watch’s internal mechanism, including the date function.

Lastly, if you notice that the date change isn’t functioning correctly, such as if the date isn’t advancing or is advancing at the wrong time, it’s recommended to have the watch serviced by a professional. Attempting to change the date yourself in this situation could cause further damage to the watch.

In summary, it’s always best to follow the manufacturer’s instructions for changing the date on your specific watch model to avoid any potential damage to the watch’s internal mechanism. Keep these situations in mind to ensure that your watch stays in top condition.

How do you fix the date on an analog watch?

To fix the date on an analog watch, you need to follow these steps:

1. Pull out the watch’s crown: The crown is usually located on the side of the watch and is used to set the time and date.

2. Turn the crown clockwise: Turn the crown clockwise until you reach the correct date. If the watch has a quick-set date function, you can simply pull the crown out to the first position and turn it until you reach the correct date.

3. Push the crown back in: Once you have set the correct date, push the crown back in to its original position. You may need to give it a gentle push or turn it slightly to ensure it is securely in place.

4. Set the time: If you have changed the date, you may also need to adjust the time. Pull the crown out to the second position and turn it until you reach the correct time.

5. Push the crown back in: Once you have set the correct time, push the crown back in to its original position. Again, you may need to give it a gentle push or turn it slightly to ensure it is securely in place.

6. Test the watch: After setting the date and time, test the watch to make sure everything is working correctly. Check that the hands are moving correctly and that the date changes at midnight.

How do I reset the date on my digital watch?

Are you feeling stuck when it comes to resetting the date on your digital watch? Fear not, here are some general steps you can follow to get the job done!

First things first, it’s essential to refer to the manual that came with your watch before attempting to reset the date. This will provide you with specific instructions on how to change the date on your particular model.

Once you’ve got the manual in hand, the next step is to locate the mode button. This button is typically found on most digital watches and allows you to cycle through the various functions of the watch.

After locating the mode button, press and hold it until the watch enters time-setting mode. This will be indicated by a flashing number or symbol, and it’s time to set the date.

Use the appropriate buttons to adjust the date while in time-setting mode. Depending on your watch, you may need to cycle through the date, month, and year separately to get the job done.

Once you’ve set the date, exit time-setting mode by pressing the mode button again.

Finally, don’t forget to test the watch to ensure that the date is displaying correctly.

If these steps don’t work for you, don’t worry. It’s always best to consult the manufacturer’s website or contact their customer support for further assistance.

Why is my Apple Watch showing the wrong date and time?

Are you struggling with your Apple Watch displaying the wrong date and time? Let’s explore some possible reasons for this perplexing issue.

Firstly, double-check that your Apple Watch is set to the correct time zone. An incorrect time zone could be the root cause of this issue. Navigate to the Settings app, select “General,” and then “Date & Time” to ensure that the “Set Automatically” toggle is enabled, and the correct time zone is selected.

If the issue persists, it could be due to problematic software updates. Check for any available updates for your watch in the Watch app on your iPhone and install any updates that are available.

Another possibility is connectivity issues. When your Apple Watch is struggling to connect to your iPhone or the internet, it may not be able to sync with the correct time and date. Give your Apple Watch and iPhone a fresh start by restarting both devices, and ensure they are both connected to the same Wi-Fi network.

In rare cases, hardware issues could also be the reason for the wrong time and date display on your Apple Watch. If you’ve tried all the above solutions to no avail, don’t hesitate to contact Apple support for further assistance.

Remember, it’s crucial to keep your Apple Watch up to date with the latest software updates, and to ensure it’s properly synced with your iPhone and the internet to avoid any issues with time and date display.

In Conclusion

In conclusion, understanding how calendar systems work and their parts is crucial to properly fix any issues with the date function on your watch.

By following the steps outlined in this article, you can troubleshoot common issues and even lubricate the system properly for optimal performance. Remember to follow the manufacturer’s recommendations and look for safety features in the driving wheel to prevent any damage from occurring.

With a little bit of patience and care, you can fix the date function on your watch and enjoy accurate timekeeping once again.