Machine does not maintain correct date and time.

When you turn your machine on for the first time, the display

prompts you to enter the current date and time. After entering,

it will not appear anymore.

NOTE: When turning on the machine after turning it off for a

long time, you need to reset date and time.

1 Press Menu until "Machine Setup" appears on the top line

of the display.

2 Press the scroll button ( or ) to display "Date & Time"

on the bottom line and press Enter.

3 Enter the correct time and date using the number keypad.

Month = 01 ~ 12

Day = 01 ~ 31

Year = requires four digits

Hour = 01 ~ 12 (12-hour mode)

00 ~ 23 (24-hour mode)

Minute = 00 ~ 59

NOTE: The date format may differ from country to country.

You can also use the scroll button ( or ) to move the

cursor under the digit you want to correct and enter a new

number.

4 To select "AM" or "PM" for 12-hour format, press the or

button or any number button.

When the cursor is not under the AM or PM indicator,

pressing the or button immediately moves the

cursor to the indicator.

You can change the clock mode to 24-hour format (e.g.

01:00 PM as 13:00). For details, see "Changing the Clock

Mode" on page 2.10.

5 Press Enter when the time and date on the display is

correct.

6 To return to Standby mode, press Stop/Clear.

Changing the Clock Mode

You can set your machine to display the current time using

either a 12-hour or 24-hour format.

1 Press Menu until "Machine Setup" appears on the top line

of the display.

2 Press the scroll button ( or ) until you see "Clock Mode"

on the bottom line and press Enter.

The clock mode currently set for the machine displays.

3 Press the scroll button ( or ) to select the other mode

and then press Enter to save the selection.
4 To return to Standby mode, press Stop/Clear.

This was taken directly from the Brother 2820 Manual:

Setting the Time

When the machine is not in use it will display the date and time. If you set up the Station ID the date and time displayed by your machine will be printed on every fax you send. If there is a power failure, you may have to reset the date and time. No other settings will be affected.

1 Press Menu/Set, 0, 2.
[2. Date/Time]
2 Enter the last two digits of the year.
Press Menu/Set.
3 Enter two digits for the month.
Press Menu/Set.
(For example, enter 09 for September,
or 10 for October.)
4 Enter two digits for the day.
Press Menu/Set.
(For example, enter 06 for 6th.)
5 Enter the time in 24-Hour format.
Press Menu/Set.
(For example, enter 15:25 for 3:25 P.M.)
6 Press Stop/Exit.
The LCD now shows the date and time
whenever the machine is idle in Fax
mode.
When the machine is in Sleep mode, the
LCD shows Sleep. (See Sleep Time on
page 2-8.)


Turning on Automatic Daylight Savings Time

You can set the machine to change automatically for Daylight Savings Time. It will reset itself forward one hour in the Spring and backward one hour in the Fall. Make sure you have set the correct date and time in the Date/Time setting.

1 Press Menu/Set, 1, 5.
[5. Auto Daylight]
2 Press Up Arrow or Down Arrow to select On (or Off).
Press Menu/Set.
3 Press Stop/Exit.

The current time and date are shown on the display when the machine is on and ready for use (standby mode). The time and date are printed on all faxes you send.
Note: If power to the machine is cut off for over 30 minutes, when power is restored, the machine prompts you to reset the time and date.
1. Press Setup. The display shows the first setup menu; FAX NUMBER/NAME.
2. Press left arrow or right arrow until 'TIME/DATE SETUP' appears, then press
Start/Enter. The display asks you to choose a date format.
3. Press Start/Enter.
4. Press left arrow or right arrow until you find the desired date format, then press
Start/Enter.
If you select USA, the time and date appears in the order of month, day, then year. The EUROPE format will be displayed in the order of day, month, then year.
The display shows the currently set time and date using the selected date format.
5. Enter the correct time and date using the number keypad.
Day = 01~31
Month = 01~12
Year = four digits
Hour = 00~23
Minute = 00~59
You can also use left arrow or right arrow to move the cursor under the digit you want
to correct, then enter a new number.
6. Press Start/Enter when the time and date on the display is correct. If you enter an invalid number, the machine beeps and does not proceed to the next step. If this happens, just reenter the correct number.
The display shows the time and date you have set, then returns to
Standby mode.
06-25-1999 12:30 ('USA' type)

But the first notch, or first snap, is the secret and the key to setting the Day and Date! In the first notch position, you'll see that if you spin the Crown one way, it will change the Day. Spin it in the opposite direction and it changes the Date! Do keep in mind that you may have to spin the Day and Date a couple rotations because it most likely will alternate between English and Spanish. Just pick the correct Language for you and it's done! When the Day and Date are set, push the Stem in all the way and enjoy your Watch! If you still have the problem with your Watch changing Dates at Noon instead of Midnight, that just means you're on the wrong 12 hr cycle. (It's set for Twelve at Night instead of Twelve at Noon) All you need to do is pull the Stem all the way out, (second notch) and Spin the Minute and Hour hands ahead 12 hours. If it's Twelve O'Clock, spin it ahead until it's Twelve O'Clock again. Doing that will put the Watch on the correct 12 hour cycle. Granted, you may have to reset your Day and Date again since you just advanced it, but at least you'll be in the correct Time Zone! Happy Spinning! google_protectAndRun("ads_core.google_render_ad", google_handleError, google_render_ad);

http://skyscanownersmanual.com/site/owners-manual

{MENU} i {#}{1}{0}{1} i {SET} M:|01/D:01/Y:07 TIME: 12:00AM 2 Enter the current month/date/year/hour/minute by selecting 2 digits for each. Example: August 10, 2007 10:15 PM (12 hour clock format) 1. Press {0}{8} {1}{0} {0}{7} {1}{0} {1}{5}. M:|08/D:10/Y:07 TIME: 10:15AM 2. Press {*} repeatedly to select “PM”. 3 {SET} 4 Press {MENU} to exit. Note: L The other party’s fax machine will print the date and time on the top of each page you send according to your unit’s date and time setting. L After setting the date and time, if the unit is in the copy mode, change it to the fax mode by pressing {FAX}. You can check your unit’s date and time setting on the display. To correct a mistake Press {<} or {>} to move the cursor to the incorrect number, and make the correction.

I have posted a video which shows step-by-step how to change the date and time, written version is available at http://www.abbeytelecom.com
I hope that this helps

SYSTEM ADMINISTRATOR
PROGRAMMING

SET DATE AND TIME DISPLAY Should it become necessary to correct the date and time displayed on all of the keysets, due of time change (twice a year), you must first access the customer programs.
To access customer programs, open system programming using the passcode you have been assigned. (Default passcode is 1234). You must use a (display phone) LCD 12B or LCD 24B keyset. ENABLE CUSTOMER PROGRAMMING While on-hook, press TRSF and dial 200. he display shows. ENABLE CUS. PROG.
PASSCODE: Dial the four digit passcode. The display shows: ENABLE CUS. PROG.
DISABLE Dial 1 or press the ▲ on the Volume to enable. The display shows: ENABLE CUS. PROG.
ENABLE Press TRSF. The keyset returns to its idle condition.
The display format is the following:
W (Day of the week): Enter 0 for Sunday and 6 for Saturday.
MM (Month): Enter 01 for January and 12 for December.
DD (Day of the month): Enter a number in the range of 01-31
YY (Year): Enter the last two digits of the year.
HH (Hours): Use the 24 hour clock and enter a number in the range of 00-24.
MM (Minutes): Enter a number in the range of 00-59. SETTING THE DATE AND TIME 1. Press TRSF and then dial the 505. The display shows: OLD: 1102802:0852
NEW: WMMDDYY:HHMM 2. Enter the new time and date using the above format: OLD: 1102802:0852
NEW: 1102802:0752 3. Verify the time and date and reenter them if necessary OLD: 1102802:0752
NEW: WMMDDYY:HHMM 4. Press TRSF to store and exit programming.
If you have entered invalid data, you will receive an [INVALID ENTRY] message for three seconds. Reenter the correct date and time. If the information you entered is incorrect, repeat steps 1 through 4.

have you done a reset?