📅 Date & Time — Free Online Calculators & Tools

Subtract the start date from the end date in milliseconds and divide by 86,400,000 (milliseconds per day). In JavaScript: Math.round((endDate - startDate) / 86400000). In Excel: =DATEDIF(start, end, "D") or simply =end-start (both cells formatted as Date).

IST (Indian Standard Time) = UTC+5:30. India is 5 hours 30 minutes ahead of UTC. India does not observe Daylight Saving Time, so this offset is constant year-round. UTC+5:30 means when it is 00:00 UTC, it is 05:30 IST.

Approximately 245–250 working days per year in India: 365 days − 104 weekend days (52 Saturdays + 52 Sundays) − 14–16 national holidays falling on weekdays = ~245–250. This varies as some holidays fall on weekends. Use the Working Days Calculator for an exact count for any date range.

DST is the practice of setting clocks 1 hour forward in spring and back in autumn to extend evening daylight. Used in the USA (March–November), UK/Europe (March–October), and most of the Americas and Europe. Countries that do NOT observe DST include India, UAE, Japan, China, and most of Asia and Africa.

Use the "Add/Subtract Days" tab in our Date Difference Calculator. It tells you the result date, day of week, and whether it falls on a working day. In Excel: =WORKDAY(start_date, days, [holidays]) adds exactly N business days (skipping weekends). Add a holidays range to also skip public holidays.