在Excel中的参考日期减去6天之间的范围内添加值

Question

i would like to add the corresponding values of dates with reference to a particular date and -6 days in excel.

For example: reference date is 10th feb 15. I would like to add values under flight time column for dates ranging between 10th feb 15 and previous 6 days.

similarly add values for a reference date and previous 30 days values and 1 year values.

Answer 1

What i wanted was, sum all the flight timings of a particular date in column A. I used the sumifs formula to achieve this.

The formula is =SUMIFS($I$8:$I$1122,$A$8:$A$1122,"<="&C8,$A$8:$A$1122,">="&C8-6)

What it does: Here the reference cell is C8 which is 6th Feb 14 step 1- date range for the calculation is 6th feb 14 minus 6 days step 2- add the values of column I which correspond to all the dates that fall within 6th feb 14 to 31st jan 14 step 3- indicate the sum in column K

Unfortunately i cannot include any pictures or files to show what i have mentioned due to site limitations.