How do you set the date & time on this calculator? it is showing 5-25-2005 and if you hit buttom again it shows 9-27-29 A

SOURCE: set date

To set the date Step by step as follows: Set the lever to "RATE SET", Press the clock/calendar key once and the date will be diplayed, key in the info as follows: 1/1/08 would be keyed in as "1" "." "1" "." "2008", the display will show 1.1-2008 then press the clock/calendar key, the correct date will show up.

To set the time Step by step as follows: Set the lever to "RATE SET", Press the clock/calendar key twice and the time will be diplayed, key in the info as follows: 12:00pm would be keyed in as "12". "00", the display will show 12.00 then press the clock/calendar key, the correct date will show up. For 12:00am key in "0",".","00" as it expects to see 24hr time.

SOURCE: Setting time & Date

I copied this from another post & it worked for me:

To enter the date

1. Be sure to switch to "rate set" from GT
2. Enter the month
3. Press the decimal point
4. Enter the day
5. Press the decimal point
6. Enter the year
Example 3.09.2007
7. Press the button that look like a clock/calendar

To enter the time

1. Be sure to switch to "rate set" from GT
2. Enter the hour (please use military time)
3. Press the decimal
4. Enter the minutes
Example: 13.24 or 9.24
5. Press the button that look like a clock/calendar

Then change the "rate set" back to the GT setting.

SOURCE: EL 1801V - how to set time/date?

To change the date, enter the date in MM.DD.YY format, pressing the decimal key between the month and day (will show as a decimal on the display) and the day and year (will show as a dash on the display). Then, press the Time/Date key (the one that looks like a clock and a calendar). The new date will show on the display. Note that if the month is less than 10, you do need to press the 0 (zero) key for the first digit, even though it will not show on the display. To change the time, enter the time in 24-hour HH.MM format, pressing the decimal key between the hour and minute. Then, press the Time/Date key. The new time will show on the display. Note that if the hour is less than 10, you do need to press the 0 (zero) key for the first digit, even though it will not show on the display. Hope this helps! :)

SOURCE: time date

i know i set this model before but i recently tried to again and it didn't work right for the time for some reason... but i do remember that you flip the middle switch to rate set, the you put in the date 12.10.08 seperated with a "." then you hit the time date button once. then you do the same with the time, hours(militarytime).minutes.seconds all seperated by a period I.E if it were 1:30 PM you woud put 13.30.00, then you hit the time button again.. the date and time should be set, might have to do it in the opposite order... but i know that is generally how its set

SOURCE: Sharp EL-1801P III Calculator Setting Time & Date

1. Switch the GT*RATE SET button to RATE SET.
2. Press the date/clock button to display current time.
3. Enter time wanted using military time. 4:52 p.m would be entered as 16.52 (Note the 16 is followed by . then enter the 52. (ie. 10:45 a.m. would be entered as 10.45)
4. Press the date/clock button again to enter new time.

Just reset mine and is current. If the built in battery needs changed, access panel is on the back. It uses a watch type battery.
~DLS