Time and Date Calculator.
Date differences, add or subtract, business days, and days until. All in your browser.
- Utilities
- Runs in your browser
How it works
What a time and date calculator does
A time and date calculator answers questions about calendar spans: how far apart two dates are, what date you get after adding days, how many business days fall in a range, or how many days remain until an event. This tool runs in your browser with four tabs and Quick Actions (Today, Yesterday, Week Ago, Month Ago). All math uses the JavaScript Date API on your device.
How to use this calculator
- Open Date Difference, Add/Subtract, Business Days, or Days Until.
- Fill the date fields (use Quick Actions to jump to common anchors).
- For Add/Subtract, choose Add (+) or Subtract (-) and a unit; for Business Days, toggle Exclude Weekends.
- Copy Result or Copy Date when you need the answer elsewhere.
Modes at a glance
| Mode | What it calculates |
|---|---|
| Date Difference | Days, weeks, months, and years between two dates |
| Add/Subtract | Add or subtract days, weeks, months, or years from a start date |
| Business Days | Counts weekdays between dates when Exclude Weekends is on (no public holidays) |
| Days Until | Days until or since a target date from today |
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How it works
Four steps.
- 01
Pick a tab: Date Difference, Add/Subtract, Business Days, or Days Until.
- 02
Enter dates with the picker or type YYYY-MM-DD values.
- 03
For business days, toggle Exclude Weekends. For add/subtract, choose unit and amount.
- 04
Read the live results, then copy any value you need.
Features
What this time and date calculator covers.
Date difference
Years, months, weeks, days, and related breakdowns between two dates.
Add or subtract
Add or subtract days, weeks, months, or years from a start date.
Business days
Count weekdays between dates when Exclude Weekends is on. Public holidays are not applied.
Days until
Days until a future date or days since a past date from today.
Copy results
Copy calculated values to the clipboard in one click.
What can this time and date calculator do?
Four modes: date difference between two dates, add or subtract days/weeks/months/years, business days with optional weekend exclusion, and days until or since a target date.
Do business days include public holidays?
No. Business days here means Monday through Friday when Exclude Weekends is on. Holidays are not in the calendar rules.
Does it handle leap years?
Yes. Calculations use the browser Date object, so leap days and month lengths are handled correctly.
Can I use it for age or countdown math?
Yes. Use Date Difference with a birth date and today for age-style breakdowns, or Days Until for event countdowns.
Is my data sent to a server?
No. All date math runs in your browser. Nothing is stored on Infyways servers.
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Built by Infyways
Need more than a tool.
These utilities are made by the Infyways studio. When a free tool is not enough, we build the real thing.
