21 months before today was 17 Sep 2023, a Sunday. Subtracting 21 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 17 days left in the middle of June to prep for an additional calculation before May. But that’s all there is to it - understand the month, if 21 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 21 months ago gets calculated on each visit:
21 months is Sunday September 17, 2023 or could be if you only want workdays. This calculation takes 21 months and only subtracts by the number of workdays in a week. Remember, removing the weekend from our calculation will drastically change our original Sunday September 17, 2023 date.
Work months Solution
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
21 months back
Sunday
September 17
Counting back from today is Sunday September 17, 2023 using a full calendar, and is also 15624 hours ago and 71.23% of the year.
Sunday Sunday September 17, 2023 was the 260 day of the year. At that time, it was 71.23% through 2023.