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Calendar date incrementer

World's simplest time tool

With this browser-based application, you can add a custom time interval to a calendar date. You can increment a date by any number of years, months, days, hours, minutes, and seconds. You can also customize the date output format to your needs or choose from over a dozen predefined date formats. Created by computer nerds from team Browserling.
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Date Increment Interval
Enter a time interval by which to increase all input dates.
Date interval examples: • 2 years 4 months 15 days • 1y 6mo 3d 20h 45m 59s • 3 months 10 seconds • 300 days
Output Date Format
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
• YYYY/YY – year, • MMMM/MMM/MM – month, • dddd/ddd – day of week, • DD – day, • hh – hour, • mm – minute, • ss – second.
Padding and Time Format
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Calendar date incrementer tool What is a calendar date incrementer?
This is a quick online utility for incrementing one or more calendar dates by any time interval. For example, if you have created a detailed plan for a trip to New York and all of a sudden the trip has to be postponed for 7 days because of bad weather conditions, then the list of your plans (such as visiting attractions and museums) have to be moved forward by 7 days. With this program, you can instantly add these 7 days to each date in your list. Or, for example, if you have made a deposit and you know it will be returned after 6 months, then you can quickly calculate this future date. To add days, months, and years to any calendar date, all you need to do is enter the dates in the input text area and specify the increment interval in the options. The input dates must be entered one per line in the standard full format "YYYY-MM-DD" or "YYYY/MM/DD", or shortened form "YYYY-MM", "YYYY/MM", and "YYYY". Additionally, you can use the expanded format that includes a clock time, such as "YYYY-MM-DD hh:mm:ss" or "YYYY/MM/DD hh:mm:ss". The interval in the options can be specified using individual date/time components that include years, months, days, hours, minutes, or seconds. For example, the interval can be "2 years", "5 months 6 days 20 hours", and "1y 2mo 10d 12h 30min 1sec". Once the program adds the interval to all current dates, it will output the new dates in the output text area. You can switch between multiple output date formats in the options or create a custom format using abbreviations to specify time/date components (see the components notation in the options). In addition to choosing a format, you can enable date padding (so that a month such as "2" is printed as "02") and change the time to a 12-hour clock format. If you are interested in date decrement, use the date decrement) tool. Timeabulous!
Calendar date incrementer examples Click to use
Increment a Date by 50 Days and 6 Hours
This example adds 50 days and 6 hours to the given calendar date. It calculates the new date and outputs it in the same format as the input date.
2022-01-30 10:00:00
2022-03-21 16:00:00
Required options
These options will be used automatically if you select this example.
Enter a time interval by which to increase all input dates.
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Find the 90th Day of Every Year
In this example, we find which day of the week and month happens to be on the 90th day from the beginning of a year. We calculate these dates for the years 2023 to 2030 and output the results in an unpadded format including the day of the week.
2023/01/01 2024/01/01 2025/01/01 2026/01/01 2027/01/01 2028/01/01 2029/01/01 2030/01/01
Saturday, April 1, 2023 0:0:0 Sunday, March 31, 2024 0:0:0 Tuesday, April 1, 2025 0:0:0 Wednesday, April 1, 2026 0:0:0 Thursday, April 1, 2027 0:0:0 Friday, March 31, 2028 0:0:0 Sunday, April 1, 2029 0:0:0 Monday, April 1, 2030 0:0:0
Required options
These options will be used automatically if you select this example.
Enter a time interval by which to increase all input dates.
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Increase all Date Parts
In this example, we increment all parts of three calendar dates at once. We add 1 year, 2 months, 3 days, 4 hours, 5 minutes, and 6 seconds to the dates, re-format the dates to a new format "YYYY, DD MMM hh:mm:ss", and use a 12-hour clock time for the clock time part.
1000-01-01 10:00:01 2000-02-02 02:02:02 3000-03-30 03:30:30
1001, 04 Mar 02:05:07 pm 2001, 05 Apr 06:07:08 am 3001, 02 Jun 07:35:36 am
Required options
These options will be used automatically if you select this example.
Enter a time interval by which to increase all input dates.
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Add One Million Days to a Date
In this example, we paste a single date "2025-05-25" in the input and shift it by one million days in the future. It turns out that in a million days it will be April 22, 4763. We switch to the custom date format mode and print the date in format 4763_04_22 (Monday).
2025-05-25
4763_04_22 (Monday)
Required options
These options will be used automatically if you select this example.
Enter a time interval by which to increase all input dates.
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Day of the Week on Birthday
In this example, we increment the birthday date from 2022 by 5 years to find out what day of the week the birthday will fall on in 2027. To get only the day of the week in the output, we turn on the custom date format mode and use the format "dddd" which prints the full name of the weekday.
2022-06-17
Thursday
Required options
These options will be used automatically if you select this example.
Enter a time interval by which to increase all input dates.
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Celebrating a Centenary
In this example, we programmatically calculate when Facebook will have its 100th anniversary. We enter Facebook's founding date equal to "2004-02-04 00:00:00" into the input and add 100 years to it. We specify the time interval in the ISO 8601 format "0100-00-00 00:00:00" and find the result in the output equal to "4 February 2104 0:0:0".
2004-02-04 00:00:00
4 February 2104 0:0:0
Required options
These options will be used automatically if you select this example.
Enter a time interval by which to increase all input dates.
Select the output date format.
Create a custom date format. (Works if you select "custom" date format in the above list.)
Use zero padding to display output dates in full format.
Convert all clock times to 12-hour format (am/pm).
Pro tips Master online time tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinetimetools.com/increment-calendar-date?input=2022-01-30%2010%3A00%3A00&interval=50%20days%206%20hours&format=YYYY-MM-DD%20hh%3Amm%3Ass&custom-format=YYYY-MM-DD%20hh%3Amm%3Ass%20%28dddd%29&padding=true&use-12-hour-clock=false
All time tools
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Quickly visualize your life in weeks or months.
Quickly print a list of neat-looking clock times (such as 10:11:12).
Quickly print a list of neat-looking calendar dates (such as 2055-05-05).
Quickly convert clock time in H:M:S format to seconds.
Quickly convert seconds to clock time in H:M:S format.
Quickly convert time in 24 hour format to 12 hour format.
Quickly convert time in 12 hour format to 24 hour format.
Quickly find how many seconds have passed since midnight.
Quickly find how many seconds are left till midnight.
Quickly find the difference between two clock times.
Quickly find the difference between two calendar dates.
Quickly find the age difference between two or more people.
Quickly add hours, minutes, and seconds to the given time.
Quickly subtract hours, minutes, and seconds from the given time.
Quickly add days, months, and years to the given date.
Quickly subtract days, months, and years to from the given date.
Quickly change the current time format to any new format.
Quickly change the current date format to any new format.
Quickly round the given clock time up or down.
Quickly round the given calendar date up or down.
Quickly drop seconds and minutes from a clock time.
Quickly drop days and months from a calendar date.
Quickly sort clock times in ascending or descending order.
Quickly sort calendar dates in ascending or descending order.
Quickly check if the given clock time is valid.
Quickly check if the given calendar date is valid.
Quickly find how many hours are in the given days.
Quickly find how many days are in the given hours.
Quickly find the astrological sign by the birthday or any date.
Quickly print a list of the dates of all astrological signs.
Quickly find the average value of multiple clock times.
Quickly find the average value of multiple calendar dates.
Quickly generate a list of random clock times.
Quickly generate a list of random calendar dates.
Quickly create a list of clock times that match your criteria.
Quickly generate a list of calendar dates that match your criteria.
Quickly split the given time period into multiple intervals.
Quickly split the given date period into multiple intervals.
Quickly generate increasing or decreasing clock times.
Quickly generate increasing or decreasing calendar dates.
Quickly print a list of all leap years.
Quickly print a list of all common years.
Quickly test if the given year is a leap year.
Quickly test if the given year is a common year.
Quickly find how old a cat would be if it was a human.
Quickly find how old a human would be if he/she was a cat.
Quickly find how old a dog would be if it was a human.
Quickly find how old a human would be if it was a dog.
Quickly convert a modern Gregorian date to a Julian date.
Quickly convert an ancient Julian date to a Gregorian date.
Quickly calculate the Julian day number for any calendar date.
Quickly convert the Julian day to a regular calendar date.
Quickly print a list of all Easter dates for all years.
Quickly convert a UNIX Epoch time to a human-readable time.
Quickly convert human-readable time to a UNIX Epoch time.
Quickly generate increasing or decreasing UNIX timestamps.
Quickly generate one or more random UNIX Epoch times.
Quickly convert a HH:MM:SS clock to a military HHMM clock.
Quickly convert a military clock HHMM to a HH:MM:SS clock.
Coming soon These time tools are on the way
Draw an Analog Clock
Draw an analog clock that shows particular time.
Draw a Digital Clock
Draw a digital clock that shows particular time.
Animate an Analog Clock
Create a GIF animation of an analog clock.
Animate a Digital Clock
Create a GIF animation of a digital clock.
Draw a Calendar
Draw a daily, monthly, or yearly calendar.
Draw a Lunar Calendar
Draw a calendar that shows moon phases.
Create an Animated Timer
Draw an animation that counts down (or up) time.
Draw an Infinite Spiral Clock
Animate a timeless clock that goes in an infinite spiral.
Draw Time as a Pie Chart
Visualize the given clock time as a pie chart.
Draw Current Year as a Pie Chart
Visualize the current year as a pie chart.
Draw Time as a Bar Chart
Visualize the given clock time as a bar chart.
Draw Current Year as a Bar Chart
Visualize the current year as a bar chart.
Draw a Time Arrow
Visualize the given clock time as an arrow.
Visualize Time Intervals
Draw a visualization of multiple time intervals.
Visualize Time Series
Draw a time series chart.
Find Season by a Date
Print the season (winter, spring, summer, autumn) by a date.
Swap Clock Hands
Swap a clock's hour hand with minute hand.
Reverse Clock Time
Find the reverse of the given clock time.
Invert Clock Time
Find the inverse of the given clock time.
Shift Clock Time
Shift the given clock time by any time interval.
Change Clock Scale
Change the clock scale from 24 hours to any other hours.
Generate Valid Clock Times
Generate a list of valid clock times.
Generate Invalid Clock Times
Generate a list of invalid clock times.
Generate Valid Calendar Dates
Generate a list of valid calendar dates.
Generate Invalid Calendar Dates
Generate a list of invalid calendar dates.
Convert English to Crontab
Create a crontab expression from human language.
Convert Crontab to English
Rewrite a crontab entry into human language.
Convert Seconds To Minutes
Find how many minutes are in the given seconds.
Convert Seconds To Hours
Find how many hours are in the given seconds.
Convert Seconds to Days
Find how many days are in the given seconds.
Convert Seconds to Weeks
Find how many weeks are in the given seconds.
Convert Seconds to Months
Find how many months are in the given seconds.
Convert Seconds to Years
Find how many years are in the given seconds.
Convert Minutes to Seconds
Find how many seconds are in the given minutes.
Convert Minutes To Hours
Find how many hours are in the given minutes.
Convert Minutes to Days
Find how many days are in the given minutes.
Convert Minutes to Weeks
Find how many weeks are in the given minutes.
Convert Minutes to Months
Find how many months are in the given minutes.
Convert Minutes to Years
Find how many years are in the given minutes.
Convert Hours To Seconds
Find how many seconds are in the given hours.
Convert Hours to Minutes
Find how many minutes are in the given hours.
Convert Hours to Weeks
Find how many weeks are in the given hours.
Convert Hours to Months
Find how many months are in the given hours.
Convert Hours to Years
Find how many years are in the given hours.
Convert Days to Seconds
Find how many seconds are in the given days.
Convert Days to Minutes
Find how many minutes are in the given days.
Convert Days to Weeks
Find how many weeks are in the given days.
Convert Days to Months
Find how many months are in the given days.
Convert Days to Years
Find how many years are in the given days.
Convert Weeks to Seconds
Find how many seconds are in the given weeks.
Convert Weeks To Minutes
Find how many minutes are in the given weeks.
Convert Weeks To Hours
Find how many hours are in the given weeks.
Convert Weeks to Days
Find how many days are in the given weeks.
Convert Weeks to Months
Find how many months are in the given weeks.
Convert Weeks to Years
Find how many years are in the given weeks.
Convert Months to Seconds
Find how many seconds are in the given months.
Convert Months To Minutes
Find how many minutes are in the given months.
Convert Months To Hours
Find how many hours are in the given months.
Convert Months to Days
Find how many days are in the given months.
Convert Months to Weeks
Find how many weeks are in the given months.
Convert Months to Years
Find how many years are in the given months.
Convert Years to Seconds
Find how many seconds are in the given years.
Convert Years To Minutes
Find how many minutes are in the given years.
Convert Years To Hours
Find how many hours are in the given years.
Convert Years to Days
Find how many days are in the given years.
Convert Years to Weeks
Find how many weeks are in the given years.
Convert Years to Months
Find how many months are in the given years.
Find Week of the Year
Given a calendar date, find which week of the year it is.
Find Day of the Year
Given a calendar date, find which day of the year it is.
Find Day of the Week
Given a calendar date, find which day of the week it is.
Convert a Bird's Age to Human Years
Find how old a human would be if he/she was a bird.
Convert a Human's Age to Bird Years
Find how old a bird would be if it was a human.
Convert Earth Time to Mars Time
Convert clock time on Earth to clock time on Mars.
Convert Mars Time to Earth Time
Convert clock time on Mars to clock time on Earth.
Generate Palindromic Times
Print a list of symmetric clock times.
Generate Palindromic Dates
Print a list of symmetric calendar dates.
Generate Equal H:M:S Times
Print a list of clock times with hrs equal mins equal secs.
Generate Equal Y-M-D Dates
Print a list of calendar dates with yr equal mon equal day.
Calculate Clock Hand Angle
Find the angle between hour hand and minute hand.
Set Clock Hand Angle
Print a list of all clock times with a specific hand angle.
Set Straight Clock Hands
Print a list of all clock times when hands are in a straight line.
Normalize Clock Times
Given clock times in various formats, convert them to one format.
Normalize Calendar Dates
Given calendar dates in various formats, make them the same format.
Spell Clock Times
Write out clock times in full text format.
Spell Calendar Dates
Write out calendar dates in full text format.
Rotate Clock Times
Cyclically shift HH, MM, SS time parts to the left or right.
Rotate Calendar Dates
Cyclically shift YYYY, MM, DD date parts to the left or right.
Freeform Time Calculator
Perform freeform clock time arithmetics.
Freeform Date Calculator
Perform freeform calendar date arithmetics.
Create Zalgo Time
Generate date and time that only Zalgo can understand.