Date & Time Tools
Date calculators, timezone converters, and timestamp utilities.
Date Calculator
Find the exact difference between two dates, or add/subtract days from a date.
Age Calculator
Calculate exact age in years, months, and days from a date of birth.
Timezone Converter
Convert a date and time across major world timezones simultaneously.
Day of the Week Finder
Find what day of the week any date falls on, plus its day and week number of the year.
Current Unix Timestamp
See the live Unix timestamp now in seconds and milliseconds.
Countdown Timer
Count down to any date and time — days, hours, minutes and seconds remaining.
Business Days Calculator
Count working days (weekdays) between two dates, excluding weekends.
Week Number Calculator
Find the ISO 8601 week number for any date, and the date range of a week.
Time Duration Calculator
Calculate the exact duration between two times or date-times.
Leap Year Checker
Check whether any year is a leap year and see upcoming leap years.
Zodiac Sign Finder
Find your western zodiac sign and Chinese zodiac animal from your birth date.
Sleep Cycle Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
Days Until Date Calculator
Count down the days, weeks and months until any future date.
Day of the Year Calculator
Find which numbered day of the year a date is, and days remaining.
Birthday Countdown
Count down the days to your next birthday and see the day of the week.
Fiscal Quarter Calculator
Find which calendar quarter (Q1–Q4) a date falls in and its date range.
Time Ago Calculator
See how long ago a past date and time was, in a human-friendly format.
Working across timezones, calculating the number of days between two dates, or converting a Unix timestamp into something human-readable are all tasks that sound trivial until you actually need to do them correctly — daylight saving transitions and leap years trip up manual math constantly. Our date and time tools handle these calculations precisely, accounting for calendar edge cases automatically, so you get a reliable answer instead of an off-by-one error.