Date & Time
Last updated: May 2026 · 9 tools in this category — no signup required
Date and time calculation tools for everyday needs and business use. Calculate exact age down to days and hours, find differences between dates, set countdown timers for events, convert between timezones, and work with Indian financial year calculations. Supports Indian public holidays and bank holidays.
All Date & Time (9 Tools)
Date Difference Calculator
Calculate difference between two dates in days, months, years
Countdown Timer
Create countdown timer to any future date or event
Timezone Converter
Convert time between different timezones worldwide
Unix Timestamp Converter
Convert between Unix timestamp and human-readable date
Date Add/Subtract
Add or subtract days, months, years from a date
Working Days Calculator
Calculate working days between two dates excluding weekends
Stopwatch
Online stopwatch with lap timing and millisecond precision
World Clock
See current time in major cities across the world
Indian Calendar
Monthly calendar with Indian national holidays, festivals and bank holidays color-coded
What are Date & Time?
Date and time tools on SabTools.in compute the answers to the 'exactly how many days?' questions that come up around birthdays, retirement planning, pregnancy tracking, leave calculations, and government-form deadlines. Age in years-months-days, working days between two dates excluding Indian holidays, date after N working days, time elapsed since a given timestamp, time zone conversion between IST and major global zones — each tool uses the IANA time-zone database so daylight-saving transitions and leap years are handled correctly.
Key Features & Capabilities
IANA time-zone correct
Every date calculation uses the modern IANA tz database (Asia/Kolkata for IST) so leap years, leap seconds, historical DST rules, and zone boundary changes are applied correctly — something naive JavaScript Date arithmetic often gets wrong.
Indian public-holiday aware
The Working Days Calculator excludes Sundays, Saturdays (if you choose 5-day week), and a built-in list of Central Government holidays including the 2026 gazetted list. State-specific holidays can be added with one click.
Multi-calendar support
Gregorian for civilian use, Vikram Samvat and Saka for tradition, Hijri for Islamic dates. Age Calculator shows all three when enabled, because elders and festival dates use non-Gregorian systems.
Second-level precision
Countdown timers, stopwatches, and 'time since' calculators update every second with drift correction, so a 180-day countdown is accurate to the second — not off by 2-3 minutes by the end like lazy JavaScript timers.
Common Use Cases
Age for exam, passport, and government form eligibility
UPSC, SSC, banking, and state-service forms require 'age as of 1st August 2026' or similar cut-off dates. The Age Calculator computes age in years-months-days for any arbitrary reference date, so eligibility can be confirmed to the day before filling the form.
Pregnancy and delivery due date
The Due Date Calculator implements the Naegele rule (LMP + 280 days) with a fetal-age toggle, trimester markers at 13 and 27 weeks, and milestone dates for the first anomaly scan, gestational diabetes test, and second ANC appointment — aligned with Indian obstetric practice.
Leave and holiday planning
Working Days Calculator tells you how many earned-leave days you will use if you travel between two dates, factoring in weekends and gazetted holidays. The Leave Planner tool extends this with sandwich-leave analysis (can I bridge two long weekends with 3 leaves?).
Retirement, superannuation, and FD maturity dates
Date Difference Calculator tells you the exact duration to your retirement, your FD's maturity date, or a lock-in ending date. Useful for ELSS lock-in (3 years from investment), PPF maturity (15 years), and NPS exit windows (age 60).
How to Choose the Right Tool
For age / duration between two dates — Age Calculator or Date Difference Calculator. For future-date arithmetic — Add Days to Date, Working Days After Today. For timezone — Time Zone Converter. For countdown or stopwatch — Countdown Timer, Stopwatch. For medical — Due Date Calculator, Gestational Age Calculator. All tools accept manual entry or quick-picks (today, yesterday, 1 Jan this year, etc.).
Date & Time Built for India
Indian date usage mixes Gregorian (civilian, legal, corporate), Vikram Samvat (Hindu almanacs and some traditional contexts), Saka (the national calendar used by the Government of India), and Hijri (Islamic religious calendar) — plus dozens of regional New Year conventions (Ugadi, Gudi Padwa, Puthandu, Pohela Boishakh). Our tools show the Gregorian answer by default but can render dates in any of these calendars when enabled. Working-day calculators know the 18 Central Government gazetted holidays and the typical state-declared optional holidays, and update annually as the next year's gazette is published. Date formats default to DD-MM-YYYY (Indian convention) not MM-DD-YYYY (American) or YYYY-MM-DD (ISO) — though ISO is available as a toggle for developers.
Who Uses These Date & Time?
HR professionals calculating employee tenure, event planners setting countdown timers, students calculating exact age for applications, and businesses tracking financial year dates.
Why Use Date & Time on SabTools.in?
Defaults to IST (Indian Standard Time). Knows Indian public holidays and bank holidays. Supports the Indian financial year (April-March) for tax and business calculations.
Popular Tools in This Category
- Date Difference Calculator — Calculate difference between two dates in days, months, years
- Countdown Timer — Create countdown timer to any future date or event
- Timezone Converter — Convert time between different timezones worldwide
- Unix Timestamp Converter — Convert between Unix timestamp and human-readable date
- Date Add/Subtract — Add or subtract days, months, years from a date
- Working Days Calculator — Calculate working days between two dates excluding weekends
- Stopwatch — Online stopwatch with lap timing and millisecond precision
- World Clock — See current time in major cities across the world
...and 1 more tools. Explore all 9 date & time above.
Frequently Asked Questions
Why does my age calculator result differ from what I used on another site?
Does the Working Days Calculator know about Dussehra and Diwali?
Is the Due Date Calculator a medical advice tool?
How accurate is the Time Zone Converter around DST transitions?
Do your tools handle leap years and the Feb 29 edge case?
Does the date difference tool handle the Indian Saka (Hindu Calendar) cross-reference?
Why does the time-zone converter show two Indian Standard Times?
Is the festival-calendar accurate for both lunar (Diwali, Eid) and solar (Pongal, Republic Day) holidays?
Related Topic Pillars
These categories pair naturally with date & time — readers often move between them.
Get New Tools & Tips Every Week
Join thousands of Indians who receive our weekly digest — new tool launches, how-to guides, finance tips, and exclusive content. No spam, unsubscribe anytime.