Difference between dates, add/subtract time, business & working days, age, event countdowns, leap year, calendar and timeline — with date formats, English/Hindi and export. 100% in your browser.
The Professional Date & Time Calculator turns the simple "days between two dates" question into a complete date-and-time workbench. From one tool you can find the exact difference between two dates down to the second, add or subtract any span of time, count only business or working days (skipping weekends and your own holidays), calculate an exact age with zodiac and birthday countdown, and run a live countdown to any event. It also shows leap years in your range, a mini calendar and a visual timeline, works in multiple date formats and in English or Hindi, and lets you copy or export the result — all instantly and privately in your browser.
Every calculation uses your browser's native date engine, which already understands month lengths, leap years and time zones. For the calendar difference the tool counts whole years, then whole months, then the remaining days, borrowing from the previous month when needed — the same way people describe durations in plain language ("2 years, 3 months, 10 days"). Alongside that human-readable breakdown it computes the raw totals (total days, weeks, hours and so on) by taking the exact millisecond gap between the two moments and dividing it down. Business-day counting walks day by day from the start to the end, skipping any weekday you mark as a weekend and any date in your holiday list.
A calendar difference includes weekends and holidays, but payroll, SLAs, courts and offices usually run on working days. This tool counts only the days that matter: choose which weekdays are your weekend (Saturday and/or Sunday, or a six-day school week), paste your public and company holidays, and it returns the exact number of business days between two dates. Presets for office (Mon–Fri), school (Mon–Sat) and government (Mon–Fri) set sensible defaults you can still adjust.
A year is a leap year if it is divisible by 4, except century years, which must be divisible by 400 — so 2000 was a leap year but 1900 was not. Because the calculator uses the browser's date engine, February 29th, leap days and month-length differences are handled automatically, and the Difference tab tells you exactly how many leap years fall inside your range and how many extra days they contribute.
The Professional Date & Time Calculator is a free, browser-based tool that answers, precisely and instantly, almost any question that involves dates and time. It began as a simple "difference between two dates" calculator and grew into a five-mode workbench because date arithmetic, in real life, is rarely just one calculation. People need to know an exact age for a form, the number of working days until a deadline, the date thirty business days from now, how long a project has run, or how many days remain until an exam or a wedding — and each of those is a slightly different problem. This tool gathers them into one clean interface so you never have to hunt for the right calculator or risk an off-by-one mistake counting on your fingers.
The default Difference mode does what the original tool did, only more thoroughly. Pick a start date and an end date and it returns the gap in the natural years-months-days form that matches how durations are written in official documents, and — because that human breakdown is not always what you need — it also gives the raw totals: total days, weeks, hours, minutes, seconds and even milliseconds. You can switch on time-of-day to include hours and minutes for precise, sub-day durations. It works no matter which date you enter first, tells you if it had to reverse them, and flags edge cases such as the two dates being identical or the range being extremely large. Beneath the numbers it draws a visual timeline from start to end and a mini calendar that highlights the range, weekends and any holidays, so the span is easy to grasp at a glance.
The Add / Subtract mode solves the inverse problem: instead of measuring the gap between two known dates, it takes one date and shifts it. Enter a base date, choose add or subtract, and specify any combination of years, months, weeks, days, hours and minutes to land on the resulting date and time. This is exactly what you need for deadlines ("what date is 45 days from today?"), reminders, contract end dates, or working out when a subscription or notice period expires. Because it uses the browser's date engine, month-length and leap-year adjustments happen automatically, so adding a month to January 31st behaves sensibly rather than producing an impossible date.
For anyone whose deadlines run on the working week, the Business Days mode is the heart of the tool. A plain calendar difference counts every day, but payroll cut-offs, service-level agreements, court and government timelines and office leave are all measured in working days. Here you choose which weekdays count as your weekend — Saturday and Sunday for most offices, or a six-day week for many schools — and paste in your public and company holidays, one date per line. The calculator then walks the range day by day and returns the exact number of business days, excluding both weekends and your holidays, with office, school and government presets to start from. This turns a tedious, error-prone manual count into a single reliable number.
The Age mode is built for the most common date question of all. Enter a date of birth and it shows the exact current age in years, months and days, the day of the week you were born, your zodiac sign, and a live countdown to your next birthday. It is equally useful for calculating a child's age for school admission or vaccination schedules, confirming eligibility for exams, jobs or pensions, or simply satisfying curiosity. The Countdown mode extends this to any future moment: pick an event — a birthday, wedding, anniversary, festival, vacation or exam, or a custom label — and the tool counts down to it in real time, updating every second, so you always know exactly how long is left.
Around these modes sit the details that make a tool feel professional. You can choose your date format — DD/MM/YYYY, MM/DD/YYYY or YYYY-MM-DD — and switch the interface and results between English and Hindi. The Difference tab reports the leap years inside your range and the extra days they add, useful for precise interest or duration calculations. Any result can be copied to your clipboard or exported as CSV, Excel or PDF, or printed, which is handy for HR records, legal filings and project documentation. A local history saves your recent calculations and lets you star favourites, all stored only in your own browser. Inputs are validated so empty, invalid or nonsensical dates are caught before they produce a wrong answer. And, as with every tool here, nothing is ever uploaded: your dates — which can be personal or confidential — are processed entirely on your device, the tool keeps working offline once loaded, and closing the tab clears everything. It is lightweight, fast, mobile-friendly and accessible, built to serve students, employees, HR professionals, project managers, accountants, legal users and businesses with equal reliability.
The same guide in Hindi / यही जानकारी हिंदी में।
Professional Date & Time Calculator एक फ्री, ब्राउज़र-आधारित टूल है जो तारीख़ और समय से जुड़े लगभग किसी भी सवाल का सटीक और तुरंत जवाब देता है। इसकी शुरुआत एक साधारण "दो तारीख़ों के बीच अंतर" calculator के रूप में हुई थी और यह पाँच-mode वाला workbench बन गया, क्योंकि असल ज़िंदगी में date arithmetic शायद ही कभी सिर्फ़ एक calculation होती है। लोगों को किसी form के लिए exact age चाहिए होती है, किसी deadline तक कितने working days हैं, आज से तीस business days बाद कौन-सी तारीख़ होगी, कोई project कितने दिनों से चल रहा है, या किसी exam/शादी तक कितने दिन बचे हैं — और इनमें से हर एक थोड़ी अलग समस्या है। यह टूल इन सबको एक ही साफ़ interface में समेटता है।
डिफ़ॉल्ट Difference mode वही करता है जो पुराना टूल करता था, पर ज़्यादा पूरी तरह। एक start date और end date चुनिए और यह अंतर साल-महीने-दिन के स्वाभाविक रूप में देता है, और साथ ही raw totals भी — कुल दिन, हफ्ते, घंटे, मिनट, सेकंड और milliseconds। आप time-of-day चालू करके घंटे और मिनट भी शामिल कर सकते हैं। यह इससे फ़र्क नहीं पड़ता कि आपने पहले कौन-सी तारीख़ डाली, और यह किनारे के मामलों (जैसे दोनों तारीख़ें एक जैसी होना या बहुत बड़ा range) को भी बताता है। नीचे यह start से end तक एक visual timeline और एक mini calendar बनाता है जो range, weekends और holidays को highlight करता है।
Add / Subtract mode उल्टी समस्या हल करता है: दो ज्ञात तारीख़ों का अंतर मापने के बजाय, यह एक तारीख़ लेकर उसे आगे-पीछे खिसकाता है। एक base date डालिए, add या subtract चुनिए, और साल, महीने, हफ्ते, दिन, घंटे तथा मिनट का कोई भी संयोजन देकर परिणामी तारीख़ पाइए। deadlines ("आज से 45 दिन बाद कौन-सी तारीख़?"), reminders, contract end dates, या notice period की समाप्ति निकालने के लिए यह बिल्कुल सही है। चूँकि यह browser के date engine का उपयोग करता है, month-length और leap-year समायोजन अपने-आप होते हैं।
जिनकी deadlines working week पर चलती हैं, उनके लिए Business Days mode टूल का दिल है। एक सादा calendar अंतर हर दिन गिनता है, पर payroll, SLA, अदालती/सरकारी समयसीमाएँ और office leave सब working days में मापे जाते हैं। यहाँ आप चुनते हैं कि कौन-से weekday आपका weekend हैं — अधिकतर offices के लिए शनिवार-रविवार, या कई स्कूलों के लिए छह-दिन का सप्ताह — और अपने सार्वजनिक व कंपनी holidays पेस्ट करते हैं, हर पंक्ति में एक तारीख़। फिर calculator range को दिन-दर-दिन चलकर weekends और holidays को छोड़ते हुए business days की सटीक संख्या देता है, office, school और government presets के साथ।
Age mode सबसे आम तारीख़-सवाल के लिए बना है। जन्म तारीख़ डालिए और यह साल-महीने-दिन में exact age, जन्म का दिन, आपकी zodiac राशि, और अगले जन्मदिन तक का live countdown दिखाता है। यह स्कूल admission या टीकाकरण के लिए बच्चे की उम्र निकालने, exams/नौकरी/pension की पात्रता जाँचने, या बस जिज्ञासा शांत करने के लिए उपयोगी है। Countdown mode इसे किसी भी भविष्य के क्षण तक बढ़ा देता है: कोई event चुनिए — जन्मदिन, शादी, सालगिरह, त्योहार, छुट्टी या exam — और टूल हर सेकंड update होते हुए उसकी उलटी गिनती करता है।
इन modes के आसपास वे बारीकियाँ हैं जो टूल को professional बनाती हैं। आप अपना date format चुन सकते हैं — DD/MM/YYYY, MM/DD/YYYY या YYYY-MM-DD — और interface तथा results को English और हिंदी के बीच बदल सकते हैं। Difference tab आपके range के leap years और उनके जोड़े गए अतिरिक्त दिनों की जानकारी देता है। किसी भी result को clipboard पर copy या CSV, Excel, PDF में export किया जा सकता है, या print किया जा सकता है। एक local history आपकी हाल की calculations सहेजती है और favourites star करने देती है, जो सिर्फ़ आपके ब्राउज़र में रहती हैं। inputs validate होते हैं। और, यहाँ के हर टूल की तरह, कुछ भी अपलोड नहीं होता — आपकी तारीख़ें आपके डिवाइस पर ही process होती हैं, और लोड होने के बाद यह offline भी काम करता है। यह हल्का, तेज़, मोबाइल-अनुकूल और सुलभ है।
Yes, completely free with no account, no signup and no limits. / हाँ, यह पूरी तरह मुफ़्त है।
No. All calculations run locally in your browser; your dates never leave your device. / नहीं, सब कुछ आपके ब्राउज़र में ही होता है।
No. If the "to" date is earlier, the tool reverses them automatically and tells you. / नहीं, यह तारीख़ें अपने-आप उलट लेता है।
Whole years first, then whole months, then remaining days, borrowing from the previous month — matching how durations are normally written. / पहले साल, फिर महीने, फिर दिन।
Calendar days include weekends and holidays; business days exclude the weekends you choose and your holiday list. / business days में weekends/holidays नहीं गिने जाते।
Yes. In Business days mode, paste your holidays (one YYYY-MM-DD per line) and they are skipped. / हाँ, holidays पेस्ट करें।
Any — Saturday, Sunday, both, or a six-day week for schools. Presets cover office, school and government. / कोई भी weekday weekend के रूप में।
Yes. The Add/Subtract mode shifts a base date by years, months, weeks, days, hours and minutes. / हाँ, Add/Subtract mode से।
Exact years, months and days from birth date to today, plus day of birth, zodiac and next-birthday countdown. / जन्म से आज तक सटीक उम्र।
Pick an event date and time; the tool counts down live, updating every second. / event तक live उलटी गिनती।
Yes, automatically, and the Difference tab shows how many leap years and extra days are in your range. / हाँ, leap years अपने-आप।
DD/MM/YYYY, MM/DD/YYYY and YYYY-MM-DD, selectable at the top. / तीनों प्रमुख formats।
Yes. Switch the language selector to हिंदी for Hindi labels and results. / हाँ, हिंदी में उपलब्ध।
Yes. The Difference tab shows a mini calendar highlighting the range, weekends and holidays. / हाँ, mini calendar में।
Yes — copy, CSV, Excel, PDF and print are all supported. / हाँ, copy, CSV, Excel, PDF और print।
Recent and starred results are stored in your own browser (localStorage). / हाल की calculations आपके ब्राउज़र में।
The total-days figure is the exact gap; business-day counting includes both endpoints if they are working days. / totals सटीक अंतर हैं।
Yes. There are no external libraries, so it works without internet once loaded. / हाँ, यह offline काम करता है।
Yes, it is responsive and the controls are labelled and keyboard-operable. / हाँ, यह मोबाइल-अनुकूल और सुलभ है।
No. Every result comes from standard date arithmetic with no AI. / नहीं, इसमें कोई AI नहीं है।
"2 months, 5 days" is the calendar breakdown; total days is the exact count — both describe the same span differently. / दोनों एक ही अवधि को अलग तरह दिखाते हैं।
This tool is privacy-first. All date and time calculations — differences, add/subtract, business days, age, countdowns and the calendar — run entirely in your browser with JavaScript. The dates you enter, which may be personal (birth dates) or confidential (contract and legal dates), are never uploaded to a server, shared with analytics, or processed by any AI service. Saved and recent calculations live only in your own browser's local storage, and clearing your browser data removes them. Because it is fully client-side, the tool keeps working offline once loaded. / यह टूल privacy-first है — सारा काम आपके ब्राउज़र में होता है, कोई तारीख़ अपलोड नहीं होती, और सहेजी गई calculations सिर्फ़ आपके ब्राउज़र में रहती हैं।