How to Use the 60-Day Calculator
Input your starting date in the From field. The calculator pre-fills the Time between field with 60 days, which you can adjust if needed. Your end date automatically populates in the To field.
By default, the counter begins on the day after your selected start date. If you want to include the starting day in your 60-day span (so the count begins on day one, not day two), enable the Include start date checkbox. This is useful when counting calendar days for formal deadlines that specify "starting from" a particular date.
The calculator also works in reverse: change the To date, and it will compute how many days have elapsed from your starting point.
60-Day Date Calculation Formula
The core calculation is straightforward arithmetic. The formula accounts for whether you include or exclude the start date as day one:
End Date = Start Date + 60 days
Time Between = End Date − Start Date + (1 if include start date, else 0)
Start Date— Your chosen reference date from which the 60-day period beginsEnd Date— The resulting date exactly 60 days after (or from) your start dateInclude start date— Boolean flag: set to 1 to count day one, or 0 to begin counting from day two
Manual Calculation Method
If you prefer to calculate 60 days without this tool, use a physical or digital calendar:
- Mark your starting date.
- Count forward day by day, or add 60 to the day of month and adjust for month boundaries.
- Account for leap days if your span crosses February in a leap year (every four years, except century years unless divisible by 400).
For example, starting from 1st July gives you 30th August. The months July (31 days) and August (30 days) total 61 calendar days; subtracting one day (if not including the start date) yields 60 days elapsed.
60 Business Days vs. Calendar Days
A 60-day period typically means 60 consecutive calendar days, including weekends. However, many professional and legal contexts use business days—weekdays only (Monday to Friday).
For 60 business days, skip weekends during your count. Starting 1st March and counting only weekdays reaches approximately 24th May. This distinction matters for government permits, contract deadlines, and corporate milestones that explicitly reference "business days." Always verify your deadline's exact wording to avoid costly errors.
Common Pitfalls When Counting 60 Days
Avoid these frequent mistakes when determining your 60-day endpoint.
- Forgetting leap years — If your 60-day span crosses 29th February in a leap year, you gain an extra calendar day. Years divisible by four are leap years, except century years (1900, 2100) unless also divisible by 400 (2000, 2400). Always verify February's length for your date range.
- Confusing business days with calendar days — Legal deadlines, visa processing, and corporate timelines often specify "60 business days," excluding weekends and sometimes public holidays. Counting all 60 calendar days will give you an earlier result. Check your contract or permit letter for this distinction.
- Off-by-one errors with start and end dates — Whether day one is your start date or the following day significantly changes your outcome. Some organisations count inclusively; others exclude the start date. When ambiguity exists, contact the relevant authority rather than assume.
- Ignoring public holidays — While calendars show weekdays, government offices and banks observe public holidays. A 60-business-day deadline might effectively shift if holidays fall within your span. Account for jurisdiction-specific closures, especially for international deadlines.