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Online Date Calculator
Count the time between two dates or add and subtract a duration from a date, with a full breakdown and visual calendars. Free and instant.
Result
Hint:Y = Years, M = Months, w = Weeks, D = Days, H = Hours, MIN = Minutes, S = Seconds
36Y
864M
1,878W 3D
13,149D
315,576H
18,934,560MIN
1,136,073,600S
From 15 Oct 1986
M
T
W
T
F
S
S
29
30
1
2
3
4
5
6
7
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9
10
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15
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31
1
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9
To 15 Oct 2022
M
T
W
T
F
S
S
26
27
28
29
30
1
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6
7
8
9
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31
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6
Result
From 15 Oct 1986
M
T
W
T
F
S
S
29
30
1
2
3
4
5
6
7
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9
10
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13
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15
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31
1
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9
To 15 Oct 2022
M
T
W
T
F
S
S
26
27
28
29
30
1
2
3
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31
1
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6
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What Is This Tool?
The Date Calculator works in two modes. The Count Days mode finds the time between a start date and an end date, broken down into years, months, weeks, days, hours, minutes, and seconds. The Add/Subtract mode takes a start date and adds or subtracts a duration in years, months, weeks, and days to find a new date. Both modes show visual calendars that highlight the range, and you can optionally include holidays. The result can be downloaded as a PDF.
How to Use This Tool?
- Choose the Count Days or Add/Subtract mode at the top.
- Enter your dates, or a start date plus a duration to add or subtract.
- Optionally open Holidays to count or exclude specific dates.
- Click Calculate, then download the result as a PDF if needed.
Key Features
- Counts the time between two dates and breaks it into several units.
- Adds or subtracts a duration in years, months, weeks, and days from a date.
- Shows visual calendars that highlight the start, end, and range.
- Optionally counts or excludes specific holiday dates.
- Download the full result as a PDF.
Examples
- From 15 Oct 1986 to 15 Oct 2022 is 36 years, which is 13,149 days.
- That same span is 1,878 weeks and 3 days.
- In Add/Subtract mode, adding a duration to a start date returns a new end date.
- Excluding a holiday that falls within the range removes that day from the count.
Common Use Cases
- Finding how long it has been between two dates, such as an anniversary.
- Counting down to a deadline or event.
- Working out a future or past date by adding or subtracting time.
- Planning project timelines across weeks and months.
- Counting days while excluding specific holidays.
Tips & Best Practices
- Double-check that the start and end dates are in the right order for what you want.
- Leave duration fields blank to treat them as zero in Add/Subtract mode.
- Use the Holidays option to count or exclude specific dates by month and day.
- Read the result across units to pick the breakdown that suits you.
- Use the calendars to confirm the highlighted range looks correct.
Limitations
- It works with calendar dates and does not account for time zones or daylight saving.
- Holiday entries are matched by month and day within the range.
- Adding months can shift the day when months have different lengths.
- It shows a fixed set of units rather than every possible breakdown.
Frequently Asked Questions
- What is the difference between the two modes?
- Count Days finds the time between two dates, while Add/Subtract starts from one date and moves forward or backward by a duration.
- How do holidays work?
- You can enter holiday dates by month and day, and the tool will count or exclude any that fall within the range.
- Which units does the breakdown show?
- It shows years, months, weeks, days, hours, minutes, and seconds for the time between two dates.
- Can I save my result?
- Yes. Click Download Result as PDF to save the breakdown and calendars as a file.
Key Terminology
- Duration
- A length of time expressed in units such as years, months, weeks, and days.
- Date range
- The span between a start date and an end date.
- Leap year
- A year with 366 days, including February 29, that affects date calculations.
- Holiday
- A specific date you can choose to count or exclude in the calculation.
- Calendar month
- A month whose length varies from 28 to 31 days, which affects month-based math.