Hi,
Here is instruction from the user's manual. the manual link is below, for downloading:
TIME CALCULATION KEY:
• Utilise 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:
Second: 0 to 99 (An entry above 60 is rounded up to one
minute. If a value of more than 3 digits is
entered, only the least significant two digits take
effect.)
http://www.sharpusa.com/files/cal_man_EL1197PIII.pdf
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