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CalculatorKosh
📅 Date & Time

Free Date & Time Calculators

Age, date difference, work hours, and time zones. All calculators are free, instant, and require no signup.

12 available

Available now

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Sunrise / Sunset Calculator

Compute sunrise, sunset, solar noon, and day-length for any city or coordinates on any date. NOAA solar position algorithm — accurate to within ±1 minute. Supports 50+ Indian cities + custom lat/long.

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Rahu Kaal Calculator

Find today's Rahu Kaal (inauspicious 1/8th of daylight) by city. Day-of-week pattern: Mon 7:30-9, Tue 3-4:30, Wed 12-1:30, Thu 1:30-3, Fri 10:30-12, Sat 9-10:30, Sun 4:30-6 (proportional to actual sunrise-sunset).

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Choghadiya Calculator

Compute the 8 day Choghadiya + 8 night Choghadiya muhurats — Amrit / Shubh / Labh (auspicious), Char (neutral), Udveg / Rog / Kaal (inauspicious). Time-of-start varies by city sunrise. Day-of-week pattern fixed.

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Panchang Calculator

Compute today's Panchang — the 5 time elements: Tithi (lunar day), Nakshatra (lunar mansion), Yoga (sun+moon combined), Karana (half-tithi), Vaara (weekday). Uses Lahiri Ayanamsa (CBDT-notified Indian sidereal reference).

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Karva Chauth Moonrise Calculator

Find the exact moonrise time for Karva Chauth (Kartik Krishna Chaturthi) in your city. Supports 50+ Indian cities + custom lat/long. Critical for the moonrise-sighting fast-breaking ritual.

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Age Calculator

Calculate exact age in years, months, days, and hours from your date of birth.

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Date Difference Calculator

Calculate days between dates, add or subtract days, and find business days.

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Time Calculator

Add, subtract, and convert hours, minutes, and seconds. Calculate time duration.

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Day Counter Calculator

Count the number of days between two dates including or excluding weekends.

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Time Zone Calculator

Convert times between different time zones and find the current time worldwide.

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Age Difference Calculator

Calculate the exact age difference between two people in years, months, and days.

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Day of Week Calculator

Find what day of the week any date falls on — past or future.

About our date & time calculators

Dates and time carry a lot of weight in everyday Indian life — calculating your exact age for a form, counting the days until an exam or a wedding, working out notice periods, or finding an auspicious time on the panchang. This category brings together precise, easy date and time tools that handle the fiddly parts for you: leap years, varying month lengths, and the IST offset that trips up so many online converters.

Popular tools here include the age calculator (exact years, months, and days), the date difference and day counter, the day-of-week finder, work-hours and time-zone calculators, and a set of India-specific almanac tools — panchang, sunrise and sunset, Rahu Kaal, and festival timings like Karva Chauth moonrise. Each result is computed carefully, and the cultural tools are presented respectfully with clear notes on how the timings are derived and when to defer to a local panchang.

All date and time calculators are free, work on any device, and require no signup. They are built for accuracy in the Indian context — IST by default, the Gregorian calendar for civil dates, and astronomical formulas for sunrise, sunset, and lunar timings. Use them for planning and reference; for binding religious muhurat or legally significant dates, always confirm with an authoritative panchang or the relevant official source.

Frequently asked questions

How does the age calculator handle leap years and exact days?
It counts the precise number of years, months, and days between your date of birth and today (or any date you choose), accounting for leap years and the actual length of each month. This matches the age that official forms and exams expect.
Do the time-zone tools use IST correctly?
Yes. Indian Standard Time is UTC+5:30, and our time-zone calculator uses that exact half-hour offset — a detail many converters get wrong. India does not observe daylight saving, so IST stays constant year-round.
Are the panchang and Rahu Kaal calculators accurate?
They use established astronomical methods — Rahu Kaal divides the day from sunrise to sunset into eight parts and marks the weekday-specific inauspicious portion, and panchang tools compute the five limbs (tithi, vara, nakshatra, yoga, karana). They are reliable for reference; for binding muhurat, confirm with a trusted local panchang.
Can I count business days or working days between two dates?
Yes. The day counter and date-difference tools can count total days, and working-day options exclude weekends. Remember to also exclude public and festival holidays, which vary by state in India.
Why does sunrise or sunset time differ from my city's listed time?
Sunrise and sunset depend on your exact latitude and longitude and the date, so they shift across cities and through the seasons. Our calculator uses the standard NOAA solar formula; enter your city's coordinates for the closest result.