1 day ago from today is 01 Jan 2025, a Wednesday. Calculating a short time span like 1 days in the past is typically straightforward. For periods under a week, it's a matter of simple backward counting, often doable with just the days of the week. Since today is Thursday, we'll have to adjust for the weekend, if you care about the number of work days. – I generally backtrack using the days of the week for quick reference. Additionally, we’ll need to consider that with 2 days until the end of January, being in the early part of of the month means that 1 day ago will keep us in January and we don’t need to worry about adjusting months or years.
All of our day calculators are measured and QA'd by our engineer. Read more about the Git process here. But here's how 1 day ago gets calculated on each visit:
1 day is Wednesday January 01, 2025 or could be if you only want workdays. This calculation takes 1 day and only subtracts by the number of workdays in a week. Remember, removing the weekend from our calculation will drastically change our original Wednesday January 01, 2025 date.
Work day Solution
Monday
Tuesday
1 day back
Wednesday
January 01
Thursday
Friday
Saturday
Sunday
Counting back from today is Wednesday January 01, 2025 using a full calendar, and is also 24 hours ago and 0.27% of the year.
Wednesday Wednesday January 01, 2025 was the 001 day of the year. At that time, it was 0.27% through 2025.