Time
Milliseconds through years, accurately.
Dashboard
Age, durations, business days, timelines.
Age, date, duration, and countdown calculators with instant time-unit widgets and business-day utilities.
28 tools1 quick widgetsOffline · No sign-up
Quick convert
Instant unit conversion.
Live conversions with zero navigation. Pin the widgets you reach for most.
Favorites
Pin tools and widgets from anywhere in this dashboard. They sync across your device.
Recent activity
Nothing yet. Convert or calculate on this dashboard and the last 100 actions appear here.
Most used
Popular calculators.
Time
Popular
Age Calculator
Your exact age in years, months, and days.
Time
Popular
Exact Age Calculator
Total lived time down to seconds.
Time
Popular
Birthday Calculator
Upcoming birthdays and their weekdays.
Time
Popular
Birthday Countdown Calculator
Days remaining to your next birthday.
Date Planning
Popular
Due Date Calculator
Add N days to a start date for a generic due date.
Date Planning
Popular
Pregnancy Due Date Calculator
Naegele-rule estimated due date from LMP.
Date Planning
Popular
Anniversary Calculator
Upcoming anniversaries and their weekdays.
Date Planning
Popular
Retirement Date Calculator
Date you reach a target retirement age.
Trending
Trending this week.
Time
Popular
Working Days Calculator
Add N working days to a start date.
Time
Popular
Business Days Calculator
Business days between two dates.
Time
Popular
Countdown Calculator
Time remaining to any target date/time.
Time
Popular
Date Difference Calculator
Difference between two calendar dates.
Date Planning
Popular
Invoice Due Date Calculator
Business-day invoice due date + early-pay discount deadline.
Date Planning
Popular
Pregnancy Due Date Calculator
Naegele-rule estimated due date from LMP.
Date Planning
Popular
Due Date Calculator
Add N days to a start date for a generic due date.
Date Planning
Popular
Payment Due Date Calculator
Due date + overdue tracking from issue + net terms.
New
Recently added.
Time
Fiscal Date Calculator
Fiscal year and quarter (configurable FY start).
Time
Calendar Week Calculator
ISO 8601 week number for any date.
Time
Popular
Day of the Week Calculator
Weekday for any date.
Time
Popular
Leap Year Calculator
Check whether any year is a leap year.
Date Planning
Popular
Invoice Due Date Calculator
Business-day invoice due date + early-pay discount deadline.
Date Planning
Popular
Payment Due Date Calculator
Due date + overdue tracking from issue + net terms.
Date Planning
Popular
Subscription Renewal Calculator
Upcoming renewal dates for any cycle.
Date Planning
Project Timeline Calculator
End date from start + business-day duration.
Coverage
Tools per category
28 tools across 2 categories.
- Time20
- Date Planning8
Your usage
Most-used items
Aggregated from your recent activity on this device. Stays local unless you sync.
Use a widget or open a calculator — usage will appear here.
FAQ
About Time & Date Dashboard.
Do widgets and history sync across dashboards?
Favorites and widget pins are global. History entries are tagged by dashboard so each dashboard shows only its own activity — with a global export available on the hub.
Are widgets accurate for professional use?
Every widget uses the same Universal Converter Engine that powers our full converter tools — deterministic factor + offset math, IEEE-754 rounding, and validated non-negative constraints where required.
Can I use this offline?
Yes. Every dashboard is fully offline-first — no external APIs are called for calculations. Installing the app to your home screen keeps it available with no network.
How accurate are the date calculators?
Every calculator uses proleptic Gregorian rules: leap year (÷4, except ÷100 unless ÷400), correct month lengths, and ISO 8601 week numbering. Nothing is rounded to the nearest month; borrowing days from the previous month is exact.
Do the tools handle time zones?
Date-only calculators are timezone-neutral — they compute on local calendar dates. Countdown and timer tools use your browser's local clock. Cross-timezone conversion is intentionally out of scope for this suite to avoid ambiguity.
Can I customize weekends and holidays?
Yes — Business & Working Day calculators accept a weekend preset (Sat+Sun, Fri+Sat, Sun-only, or none) and a free-form list of holiday dates in YYYY-MM-DD format.
Does the Age Calculator match how humans count age?
Yes. It borrows days from the previous month when needed, so a person born on Feb 29 ages exactly one year on Feb 28 in non-leap years and on Feb 29 in leap years.
Is the Pregnancy Due Date a medical tool?
No — it's an educational estimator using Naegele's rule (LMP + 280 days, adjusted for cycle length). Always confirm gestational age with a qualified clinician.
How do project timelines handle weekends?
The Project Timeline and Working Days calculators step forward one business day at a time, skipping the configured weekend and any holidays you provide, so an N-business-day project actually finishes on a working day.
What terms do the invoice calculators support?
Any Net-N terms in either calendar days (Payment Due) or business days (Invoice Due), plus an optional early-pay discount window (e.g. 2/10 Net 30).
Are subscription renewals accurate across month boundaries?
Yes — we clamp the day to the last valid day of the target month, so a Jan 31 subscription renews on Feb 28/29 correctly instead of overflowing into March.
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