Placed battery in clock. It went to cortrect day and date but the time is three hours off due to showing Pacific time. I am in the Eastern time zone. How do I adjust it?

Try this for 7500

How To Adjust the Time and Zip Code Settings on DVR+ ...

Channel Master https://support.channelmaster.com > en-us > articles
DVR+ Set Time and Date. Please go to Menu>Settings>Time & Date. Zip Code should be orange. If Zip Code number is correct, then no need to update.

User Manual

https://www.manualslib.com/manual/633661/Channel-Master-Cm-7000pal-Dvr.html#manual

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There are many models of Centrios brand alarms.

Here is some advice found on the web
1:
All buttons are on the back of the clock. To set the time zone, push "menu"; then push "Set" until the correct time zone is displayed (EA = Eastern, PA = Pacific, etc); then push "Menu" again - DONE. To adjust time, date, year & day, push & hold "Set" until the hour begins to flash; then push "Adjust" until the correct hour is reached; then push "Set"; repeat this sequence as the clock moves on to the next flashing segment (e.g. minute, seconds, month, date, & year); the clock will automatically set the Day based upon the Month, Day & Year you select - DONE.
2:
Press theSETkey to enter the mode"Manual Time Setting".
Manual Time Setting
In case the Skyscan Atomic Clock is not able to detect the WWVB-signal (disturbances, transmitting distance, etc.), the time can be manually set. The clock will then work as a normal Quartz clock.
Note:
In 12 hours mode the time will be displayed with an additional"PM"for the time from 12:00 noon until 11:59.
1. The hour digits will start flashing on LCD1. Set the desired hours by pressing the+key followed by pressing theSETkey.
2. Now the minute digits will start flashing. Set the desired minutes by pressing the+key . If the + key is held, the units will increase by 5.
3. Press theSETkey to move to the"Year Setting".

find the setting section and find the clock and adjust it there

Go to settings, Time and Date, make sure that the time zone is not gray out, if it is, disable automatic time zone, scroll down to the time zone and change it to Pacific, which is GMT -08:00

Radio controlled atomic clock self sets, and self adjusts automatically. This clock is very easy to use!,Daylights Saving Time on/off option; 4 Time Zones - Pacific, Mountain, Central, or Eastern,Folds into smaller size for easy storage and travel; travel pouch included,Automatically sets day, date and time; 2 separate alarms - great for weekends,Sturdy, contemporary construction. Stand folds for easy storage. 2x AAA batteries included; as shipped to U.S. Government and institutions

To set up your clock simply install one fresh AA, LR6 ALKALINE battery. Due to the nature of long wave radio signals it is normally not possible to receive a signal during the day so it is best to install the battery late in the evening. Select your time zone by pressing one of the four time zone buttons PT-Pacific Time, MT-Mountain Time, CT-Central Time, ET-Eastern Time. The time zone buttons may be pressed any time after installing the batteries. If multiple buttons are pressed the clock will set to the time zone selected last. If no time zone is selected the clock will default to Pacific Time. Another time zone can be selected during or after the clock has set itself. Your clock can only set itself to one of the four time zones stated above. For time zones outside of PT, MT, CT or ET you must manually set the time using the Manual Time set button on the back of the movement.
When the battery is installed the second hand will advance eight seconds (two seconds per step x four steps). The clock is now searching for a signal. For the initial setting it is recommended to stand the clock in an upright position near a window. Within five minutes the clock will either receive the WWVB signal and set itself to the exact time, or it will determine that the signal is not receivable at its current location and time of day. If a signal is not receivable it will fast-forward the hands to the 4, 8, or 12 o'clock position and search for WWVB each
hour until a signal is received. If the time is manually set the clock will continue to periodically search for a signal and automatically reset the hands when the signal is received.

Here is the procedure for setting the time zones for your Clock/Radio. Setting The Time, The First Time IMPORTANT: The first time you connect your new SmartSet® clock radio to the AC outlet the internal computer will automatically set the time correctly for the Eastern Time Zone, which is the initial default setting. The display will scan for a few seconds and then show the correct Day and Time in the Eastern zone. If you live in the Eastern Time zone, there?s nothing else to do. Your clock is set correctly and running. If you do not live in the Eastern Time zone you must change the default zone display to your own zone. You only do this one time and the SmartSet® will remember the new default zone setting and will always return to that setting after a power interruption. There are 7 time zones programmed into your SmartSet® clock radio as follows: ZONE 1 ? Atlantic Time ZONE 2 ? Eastern Time (Default Setting) ZONE 3 ? Central Time ZONE 4 ? Mountain Time ZONE 5 ? Pacific Time ZONE 6 ? Yukon Time ZONE 7 ? Hawaiian Time To change the default time zone display, depress the Time Zone button. The number ?02? will appear on the display indicating that the default zone is ZONE 2, Eastern Time I will give you the web link for the owners manual so you can find any other information you might need for your Clock/Radio. (http://www.emersonradio.com/owners/iPod%20Series/iC200_042007.pdf) copy this web address and paste it in the address bard of your browser and it will take you to a pdf copy of the owners manual. I hope this information help you with your problem.

Choosing a time zone. To select Pacific, Eastern, Mountain or Central time zone, press ZONE button inside battery compartment of clock unit.

For the Sharp SPC374T Atomic Clock - Time Zone setting- Press the 'Time' button once, the time zone will show where 'Day' usually is, use the Up or Down buttong to adjust.

For the outdoor Thermo, credit to my neighbor for this one. Remove battery from main unit, wait 2-3 minutes. Reload batteries. Once you get a reading from the outdoor sensor, hit the reset on the main unit. You will have to reset the time zone as described above, but this worked for me after 10 months of no outside temp showing up!

Good luck,
Doc