Overview Of Keys; Clock Calendar Key; Time Calculation Key - Sharp el-2630piii Operation Manual

 A maximum of 4 digits can be stored (decimal point is
not counted as a digit).
Note: 
 Be sure to set this selector to the " " position after
storing an each rate.
 For the conversion rate and the tax / discount rate, a
single value can be stored for each. If you enter a
new rate, the previous rate will be cleared.
 Each time this key is pressed, the mode switches.
Calculation mode →Date display mode →Clock display
mode → Calculation mode
 Use this key also to adjust date and time (see "GRAND
TOTAL / RATE SETTING MODE SELECTOR").
 Utilize this key to enter hours and minutes in time
calculations.
 Press this key after entering an hour or minute value. (There
is no need to press this key when entering a second value.)
 To bypass hour entry, press this key after entering 0.
 To bypass minute entry, you may press this key alone, or
press it after entering 0.
 When this key is pressed, if the preceding entry is in any of
the following ranges, it is set as an hour or minute value:
Hour: Within 6 digits
Minute: 0 to 99 (An entry above 60 is rounded up to one
hour. If a value of more than 3 digits is entered, only the
least significant two digits take effect.)
 A second value is set when it is entered in the following
range:
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