99+ Free Tools · 20 Countries · 15 Languages

Date & Time Calculator — Free Online

Professional-grade date and time calculators trusted by millions. From simple date differences to business-day scheduling, pregnancy due dates, and timezone conversions — all free, instant, and accurate.

Date Difference Calculator

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Instant Results
Every calculation runs client-side — no page reload, no waiting.
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IANA Timezone Database
Accurate DST transitions for every timezone on Earth.
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Proleptic Gregorian Calendar
Correct results for dates before 1582 and all leap years.
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No Sign-up Required
Completely free forever — no account, no ads, no tracking.

All Date & Time Tool Categories

Organised into 15 topic clusters — click any category to explore every tool it contains, or jump straight to the tool you need via the links below.

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Date Calculators
The foundational date-math tools that answer the most common calendar questions people sea…
Pillar Cluster — Core
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Time Calculators
A complete suite of tools for adding, subtracting, and converting units of time with preci…
Pillar Cluster — Core
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Age Calculator
Tools that calculate precise ages, upcoming birthdays, and life milestones from a date of …
Pillar Cluster — Core
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Business Days
Work-focused date tools that skip weekends and public holidays for accurate professional s…
Pillar Cluster — Core
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Time Zone & World Clock
Tools for converting times across global time zones, coordinating international meetings, …
Pillar Cluster — Core
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Countdown & Events
Countdown tools for major life events, holidays, and personal milestones that drive large …
Pillar Cluster — Seasonal
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Time Unit Converters
Simple, fast converters between all common units of time, from seconds to years. These ref…
Supporting Cluster — Reference
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Calendar & Year Tools
Printable calendars, leap year lookups, and year-level date tools that attract consistent …
Supporting Cluster — Evergreen
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Week Number Tools
ISO week number lookups and week-based date calculators used heavily in European business,…
Supporting Cluster — Reference
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Health & Pregnancy
Pregnancy, fertility, and health timeline tools that help expecting parents and healthcare…
Specialty Cluster — Health
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Life Milestones
Shareable, emotionally resonant tools that help people reflect on their life in time. Thes…
Specialty Cluster — Viral
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Developer & Technical
Technical date and time reference tools built for software developers, data engineers, and…
Specialty Cluster — Developer
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Finance & Legal
Date calculators for high-stakes financial and legal scenarios where an incorrect date can…
Specialty Cluster — Professional
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Astronomy, Sun & Moon
Sun and moon calculators that appeal to photographers, gardeners, sailors, and astronomy e…
Specialty Cluster — Interest

Available in 20 Countries

Every tool pre-configured with local timezone, date format, and public holidays. RTL support for Arabic-speaking regions.

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India
Kolkata
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Philippines
Manila
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United Kingdom
London
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Indonesia
Jakarta
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Malaysia
Kuala Lumpur
🇿🇦
South Africa
Johannesburg
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Egypt
Cairo
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UAE
Dubai
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Bangladesh
Dhaka
🇱🇰
Sri Lanka
Colombo
🇩🇪
Germany
Berlin
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Singapore
Singapore
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Thailand
Bangkok
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United States
New York
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Canada
Toronto
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Australia
Sydney
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France
Paris
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Spain
Madrid
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Brazil
Sao Paulo
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Mexico
Mexico City
99+
Free Tools
20
Countries
15
Languages
0
Sign-ups Needed
👨‍💻
Built & validated by Vipul Jaganiya
Computer Science · Calendar Mathematics & Timezone Engineering
All formulas are tested against the proleptic Gregorian calendar and the IANA timezone database. Accurate across leap years, DST transitions, and all date formats.