I'm trying to figure out "how to" subtract days from a date in Google Sheets.
Col A (original date) Col D (date - 5 days) 08-08-16 08-03-16
A1 will display the original "date" and D1 will have a "formula" that displays A1-5days.
Internally, dates are represented as numbers on the scale 1 = one day. (Technically, it is the number of days since December 30, 1899, but one usually doesn't need to know this). So, moving 5 days back into the past means subtracting 5:
D1 = A1 - 5
If you wanted to move 3 hours forward, that would be
D1 = A1 + 3/24.
Normally, the sheet will recognize that the input of a formula is a date, and automatically format the output as a date. If this does not happen, apply date formatting to the D cell.