121 months before today was 22 May 2015, a Friday. Subtracting 121 months in the past is usually just counting from June; 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 22 days left in the end of June to prep for an additional calculation before May. But that’s all there is to it - understand the month, if 121 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 121 months ago gets calculated on each visit:
121 months is Friday May 22, 2015 or could be if you only want workdays. This calculation takes 121 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 May 22, 2015 date.
Work months Solution
Monday
Tuesday
Wednesday
Thursday
121 months back
Friday
May 22
Saturday
Sunday
Counting back from today is Friday May 22, 2015 using a full calendar, and is also 90024 hours ago and 38.9% of the year.
Friday Friday May 22, 2015 was the 142 day of the year. At that time, it was 38.9% through 2015.