100 months before today was 30 Dec 2016, a Friday. Subtracting 100 months in the past is usually just counting from April; however, longer calculations will push us from 2025 into 2024 or further. Even if the calculation remains within the year, I usually take note of the 30 days left in the end of April to prep for an additional calculation before March. But that’s all there is to it - understand the month, if 100 months will change the year, season, or fiscal calendar, and subtract your dates.
All of our day calculators are measured and QA'd by our engineer. Read more about the Git process here. But here's how 100 months ago gets calculated on each visit:
100 months is Friday December 30, 2016 or could be if you only want workdays. This calculation takes 100 months and only subtracts by the number of workdays in a week. Remember, removing the weekend from our calculation will drastically change our original Friday December 30, 2016 date.
Work months Solution
Monday
Tuesday
Wednesday
Thursday
100 months back
Friday
December 30
Saturday
Sunday
Counting back from today is Friday December 30, 2016 using a full calendar, and is also 74400 hours ago and 100.0% of the year.
Friday Friday December 30, 2016 was the 365 day of the year. At that time, it was 100.0% through 2016.