What was the date 100 months ago?


Thursday January 28, 2016


100 months before today was 28 Jan 2016, a Thursday. Subtracting 100 months in the past is usually just counting from May; however, longer calculations will push us from 2024 into 2023 or further. Even if the calculation remains within the year, I usually take note of the 28 days left in the end of May to prep for an additional calculation before April. 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.

How we calculated 100 months before today

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:

  1. We started with date inputs: used current day of 28 May, then set the calculation - 100 months, and factored in the year 2024
  2. Noted your current time of year: 100 months in May will bring us back to April or further.
  3. Counted backwards months from current day: date - 28 May, factoring in the 28 days left in May to calculate Thursday January 28, 2016
  4. Did NOT factor in workdays: In this calculation, we kept weekend. See below for just workdays or the fiscal calendar

Tips when solving for January 28

  • Current date: 28 May
  • Day of the week: Thursday
  • New Date: Thursday January 28, 2016
  • New Date Day of the week: Thursday
  • Counting back form January will put you close, if not passed, the previous year.
  • This calculation crosses at least one month. Remeber, this will change our day of the week.
  • The solution crosses into a different year.

Ways to calculate 100 months ago

  1. Calculate it: Start with a time ago calculator. 100 months is easiest solved on a calculator. For ours, we've already factored in the 28 days in May + all number of days in each month and the number of days in . Simply add your months and choose the length of time, then click "calculate". This calculation does not factor in workdays or holidays (see below!).
  2. Use May's calendar: Begin by identifying 28 May on a calendar, note that it’s Thursday, and the total days in April (trust me, you’ll need this for smaller calculations) and days until last year (double trust me, you'll need this for larger calculations). From there, count backwards 100 times months by months, subtracting months from until your remainder of months is 0.
  3. Use excel: For more complex months calculations or if you h8 our site (kidding), I use Excel functions like =TODAY()-100 to get or =WORKDAY(TODAY()), -100, cell:cell) for working months.

Working months in 100 calendar months

100 months is Thursday January 28, 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 Thursday January 28, 2016 date.

Work months Solution

Date 100 work months ago
Tuesday July 10, 2012

Week of Thursday January 28, 2016




100 months back


January 28




The past 100 months is equivalent to:

Counting back from today is Thursday January 28, 2016 using a full calendar, and is also 74400 hours ago and 7.67% of the year.

100 months = 74400 hours

100 months = 100.0 months

100 months = 442.857 weeks

100 months = 8.493 years

100 months = 4464000 minutes

100 months = 267840000 seconds

Did you know?

Thursday Thursday January 28, 2016 was the 028 day of the year. At that time, it was 7.67% through 2016.

In 100 months, the average person Spent...

  • 665880.0 hours Sleeping
  • 88536.0 hours Eating and drinking
  • 145080.0 hours Household activities
  • 43152.0 hours Housework
  • 47616.0 hours Food preparation and cleanup
  • 14880.0 hours Lawn and garden care
  • 260400.0 hours Working and work-related activities
  • 239568.0 hours Working
  • 392088.0 hours Leisure and sports
  • 212784.0 hours Watching television

What happened on January 28 (100 months ago) over the years?

On January 28:

  • 1925 Actress Gloria Swanson (25) weds aristocrat Henri de la Falaise (26) in Paris, France
  • 2017 Australian Open Women's Tennis: Serena Williams defeats older sister Venus Williams 6aEUR"4, 6aEUR"4 for her 7th Australian title and record 23rd Grand Slam event singles victory