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However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization.
The actual start date can be entered for this argument or the cell reference to the location of this data in the worksheet can be entered instead.
end_date - (required) the end date of the chosen time period.
This time period can be calculated in: Uses for this function include planning or writing proposals to determine the time frame for an upcoming project.
It can also be used, along with a person's birth date, to calculate his or her age in years, months, and days.
Which one you use, therefore, depends on the results you want.