In animal models, SIRT1, via the enzymes it encodes, has been shown to have healthspan extending regulatory effects on metabolism, stress resistance, cellular survival, cellular senescence, inflammation-immune function, endothelial function, and circadian rhythms.
DATEDIF Example: Calculating the Difference in Days. 1  Click on cell B2 to make it the active cell - this is where the number of days between the two dates will be displayed; 2  Type = datedif ( into cell B2; 3  Click on cell A2 to enter this cell reference as the start_date argument for the function;
An easier way in figuring out due dates is to take the first day of your last period, count backward 3 months, add 7 days, and add an entire year. This is called Naegele's Rule. (Alternatively, to get the same result, you can take your LMP, add 1 week, and add 9 months.). 4. Choose other methods to calculate your due date if you cannot remember the date of your LMP or have irregular periods.