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Home / Date & Time / Weeks Between Dates Calculator
Date & Time

Weeks Between Dates Calculator

Calculate exact weeks and days between dates, then audit endpoint rules, ISO weeks, custom workdays, closures and recurring week schedules.

Elapsed spandate-only UTC arithmetic avoids daylight-saving hour shifts
Calendar decompositionfull weeks, complete months and completed years stay distinct
Boundary verificationinspect endpoint counting and clamped month/year anchors
Updates as you change either date
Weeks between dates
—
—
—Total days
—Exact weeks
—Weekdays
—Weekend days
Start—
End—
Calendar contextSame elapsed span
Earlier date—
Later date—
Input direction—
Counting rule—
Counting options & quick ranges

A week is exactly seven calendar days. Date-only UTC arithmetic avoids daylight-saving clock shifts.

Date span conventions & reverse verification

The headline calculator stays focused on weeks. This independent audit shows the same date pair under the counting conventions that commonly produce different answers across calculators and spreadsheets.

Primary unit focus—
Elapsed interval—
Calendar dates counted—
Full weeks + remainder—
Complete months + remainder—
Calendar Y / M / D—
Full-week anchor—
Complete-month anchor—
Completed-year anchor—
—·—
Choose two dates above.
Verify the date span
Cross-check the calendar boundaries behind the main answer before you reuse it in a schedule, report, or spreadsheet.
Start weekday—
End weekday—
ISO week range—
Leap days crossed—
Choose two dates to verify the boundary rule.
Count total daysCompare calendar monthsFind the midpoint
Core timing workflows
Start with a direct timer, stopwatch, alarm or focus workflow. Calendar, date arithmetic, clocks and scheduling specialists remain available from the full Date & Time hub.
All 76 date & time tools
Online TimerCountdown, sound, repeat & fullscreenStopwatchLaps, precision & fullscreenCountdown TimerFocused countdown workflowAlarm ClockAlarm at a local clock timePomodoroFocus and break cyclesInterval TimerWork/rest roundsPresentation TimerTalk timing with warningsClassroom TimerProjector-friendly countdown
Calendar consistency audit
Cross-check the same date pair as total days, full weeks, complete calendar months and completed years, with month-end anchors and inclusive-day evidence.
High-impression second pass
Independent verification layer; the primary tool remains the source of the displayed result.


Exact week-span planning & audit
Week Span Planning Studio
Keep the fast answer above, then audit the same date range for endpoint rules, ISO weeks, configurable workdays, closure dates and recurring week milestones. Everything runs locally with date-only UTC arithmetic.
4 endpoint conventionsISO week evidenceCustom workweek + closuresWeek ledger + milestonesCSV · ICS · JSON · printLocal history + share


1. Dates & counting policy
These dates stay synchronized with the quick calculator above. Reversed input is preserved as an input-direction fact while totals use the chronological span.
Date-only · UTC


2. Workweek & closure policy
Select any recurring workweek, then add exact closure/holiday dates you want excluded. No country holiday feed is applied silently.
A closure only subtracts a configured workday when it lies inside the counted endpoint interval. Duplicate closure dates are de-duplicated.


3. Exact results & calendar evidence
The primary answer remains whole weeks plus remaining days. The audit surfaces alternate planning views without pretending that months or time zones are fixed-length weeks.
Counted week span——
Counted days—
Decimal weeks—
Fortnights—
Weekdays—
Weekend days—
Configured workdays—
Workweek equivalents—
Full aligned weeks—
ISO weeks at inputs—
Week segments touched—
Same weekday at both inputs?—
Counted closure exclusions—
Arithmetic rule1 week = exactly 7 calendar days
DST/time-zone ruleDate-only UTC; clock shifts are not part of this calculator
Ready.


4. Week-by-week ledger
See how the counted interval lands inside Monday- or Sunday-based calendar weeks, with configured workdays and closure exclusions per segment.
—
#Counted datesDaysWorkdaysClosuresISO weekCalendar week
Very long spans keep exact summary totals but cap the ledger to the first and last 260 week segments so the page stays responsive.


5. Recurring week milestones
Build a weekly, biweekly, four-week or quarterly-style cadence from the literal start date toward the literal end date.
—
#DateWeeks from startISO weekLabel
Milestone planning and ICS export are capped at 104 generated occurrences per run. Exports use all-day dates and do not add clock times or time zones because this page models calendar dates only.


6. Save, export & share
Keep repeat-use spans in local browser storage or move the current workbench as a JSON file. Portable links encode the visible dates and planner settings in the URL fragment.
Current audit summary
—


Scope & trust boundary. The Studio counts proleptic Gregorian calendar dates using UTC midnight arithmetic, so daylight-saving changes do not alter a date-only span. It does not silently fetch public holidays, payroll rules, legal deadline rules or time-zone offsets. Enter closure dates yourself when they matter, and verify jurisdiction-specific deadlines against the governing source.


How to calculate weeks between two dates
For the standard elapsed result, subtract the earlier calendar date from the later date to get total days, divide by seven for decimal weeks, then split the same day total into whole weeks and the remaining zero to six days. The quick calculator above does exactly that with date-only UTC arithmetic, so a daylight-saving clock change does not turn one calendar day into 23 or 25 hours.
Which endpoint rule should I use?
Include start, exclude end is the usual elapsed-span convention: January 1 to January 8 is seven days, or exactly one week. Include both counts calendar dates instead, making the same endpoints eight counted days. The advanced Studio also exposes exclude-both and exclude-start/include-end conventions so a handoff can state exactly which boundary rule produced the number.
Weeks versus calendar weeks
Seven elapsed days always make one duration week, but a calendar week is aligned to a chosen weekday boundary. The Studio reports how many Monday- or Sunday-based week segments the range touches and how many complete aligned seven-day blocks sit entirely inside the counted interval. ISO week labels always use the ISO Monday-based week-year convention.
Working weeks and closure dates
A working week is a policy, not a universal calendar constant. Choose the weekdays that count for your schedule and enter closure dates explicitly. The result shows configured workdays and workweek equivalents without pretending that every organization follows Monday through Friday or that a global holiday feed would be authoritative for your situation.
Recurring weekly schedules
The milestone planner walks from the literal start input toward the literal end input in exact seven-day increments. Use one week for weekly check-ins, two weeks for biweekly cycles, four weeks for fixed four-week periods, or a longer cadence. The ICS export contains all-day dates only; it deliberately does not invent a local time or time zone.
Why the date-only model matters
Questions about weeks between calendar dates are usually different from questions about elapsed hours between two instants. If clock times and zones matter, use a date-and-time duration tool instead. This page keeps the date-only model inspectable, exports the counting evidence, and leaves legal, payroll and jurisdiction-specific deadline interpretation to the applicable source.
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