Everyday Tools

Date Difference Calculator

Compare two dates and see the time between them in days, weeks, approximate months, and approximate years.

Updated April 11, 2026
Free online tool
Planning and research use

Why this page exists

Date math is easy to get wrong when you are counting by hand across different month lengths. This calculator compares two dates directly and gives the gap in a few formats that are useful for planning, timelines, and quick research.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Date difference calculator

Compare two dates and see the time between them in a few common ways.

Result

100 days

There are 100 days between Jan 1, 2026 and Apr 11, 2026.

Total days100 days

Total weeks14.3 weeks

Approximate months3.3 months

Approximate years0.27 years

Apr 11, 2026 comes after Jan 1, 2026.
Months and years are approximate because calendar months have different lengths.
Use total days for countdowns and deadlines, then use weeks or months for broader planning.

Total days are exact based on the dates entered. Weeks, months, and years are shown as practical approximations.

Planning note

Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose a start date and an end date to compare the gap between them.

The calculator finds the exact total days, then translates that gap into weeks plus approximate months and years for easier planning.

Read the note in the result panel when you need to understand whether the end date comes before or after the start date.

Understanding your result

Total days are the most precise way to understand the gap between two dates. Weeks, months, and years are useful for rough planning, but they are approximations because calendar months do not all have the same length.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Count down to a deadline

Use the exact total days to see how much time is left before a move, event, renewal, or project milestone.

Compare how long a plan will take

The approximate months and years are helpful when you want a faster read on a long timeline without counting each month by hand.

Check the span between financial dates

Compare statement dates, loan milestones, or planning checkpoints to get a quick sense of how much time separates them.

FAQ

Common questions

Are the month and year results exact?

No. Months and years are shown as practical approximations because calendar months have different lengths. The total day count is the exact part of the result.

What happens if the end date is earlier than the start date?

The calculator still shows the size of the gap and explains in the result notes that the end date comes before the start date.

Which number should I use for deadlines?

Use the total days for deadlines, countdowns, and precise planning. Weeks, months, and years are better for broader estimates.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Everyday ToolsUpdated April 11, 2026