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Date sequence generator

World's simplest time tool

With this browser-based application, you can create a sequence of calendar dates. You can switch between ascending or descending date order and specify the duration between consecutive dates. You can also specify the start date, change the sequence length, and adjust the date separator symbol. Additionally, you can control date padding, choose the calendar date format from a variety of predefined formats, adjust the clock time format, and create arbitrary new date formats. Created by computer nerds from team Browserling.
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Sequence Start and Length
Set the first calendar date of the sequence.
Set the total length of the date sequence.
Set the delimiter symbol of the date sequence.
Date Order and Interval
Create a sequence of dates in ascending order.
Create a sequence of dates in descending order.
Set the interval to increase or decrease dates by.
Set the deviation factor for generating non-linear date sequences.
Calendar Date Format
Use 12hr clock in a sequence.
Use padded dates in a sequence.
Select calendar date format.
Create date format with notation: • YYYY/YY – year • MMMM/MMM/MM – month • dddd/ddd – day of week • DD – day • hh – hour • mm – minute • ss – second
Date sequence generator tool What is a date sequence generator?
This is a quick online utility for generating a sequential list of increasing or decreasing calendar dates. The sequence starts from the specified date and has the specified length. For example, the start date could be "2000-01-01", the sequence length could be 12 dates, and the interval between the dates could be "6 months". This sequence will then look like this: 2000-01-01, 2000-07-01, 2001-01-01, 2001-07-01, …. The calendar dates in the list may increase or decrease depending on the selected mode. In the options, you can specify the interval between two consecutive dates in the sequence. For example, the interval "1 month 2 days" creates the sequence: 2000-01-01, 2000-02-03, 2000-03-05, 2000-04-07, …. Similarly, you can specify the interval using other date and time components and their abbreviations: "1 year", "20 hours", "4yr 6mo 20d 40min", and so on. The program also has an additional option called "Fuzzy Interval". It allows you to create slighly random intervals between the sequence dates. For example, if the full interval is "20 days" and the fuzzy interval is "2 days", then the program will introduce up to 2 day perturations in the intervals so that they range from 20-2 days to 20+2 days. That is, the intervals between dates will be 18, 19, 20, 21, or 22 days. By default, the program displays all dates in a vertical column, but you can specify any date separator in the options. If the dates also include a clock part, then you can change the time format by switching from a 24-hour clock to a 12-hour clock. You can choose from a variety of date and time formats, including numeric months, spelled months, full days of the week or abbreviated days of the week. You can also create your own calendar date format by selecting the "Custom" mode from the list and entering a date template using special date component symbols (such as "YYYY", "MM", "DD", and others). Timeabulous!
Date sequence generator examples Click to use
Increasing Calendar Dates
In this example, we create an ascending sequence of calendar dates. We start from the date 2025-01-01 and increment each subsequent date by 20 days. We generate 10 sequence items and output them in a vertical column.
2025-01-01 00:00:00 2025-01-21 00:00:00 2025-02-10 00:00:00 2025-03-02 00:00:00 2025-03-22 00:00:00 2025-04-11 00:00:00 2025-05-01 00:00:00 2025-05-21 00:00:00 2025-06-10 00:00:00 2025-06-30 00:00:00
Required options
These options will be used automatically if you select this example.
Set the first calendar date of the sequence.
Set the total length of the date sequence.
Set the delimiter symbol of the date sequence.
Create a sequence of dates in ascending order.
Set the interval to increase or decrease dates by.
Set the deviation factor for generating non-linear date sequences.
Use 12hr clock in a sequence.
Use padded dates in a sequence.
Select calendar date format.
Create date format with notation: • YYYY/YY – year • MMMM/MMM/MM – month • dddd/ddd – day of week • DD – day • hh – hour • mm – minute • ss – second
Decreasing Calendar Dates
In this example, we switch to the descending date sequence mode and generate a print-out of 6 dates. We subtract several different date and time components from the starting date (we subtract 1 year, 4 months, 10 days, and 6 hours), and we also set the fuzzy interval to 2 days. The fuzzy interval adds a little bit of randomness in the days component and instead of it always being 10 days, it can now be 8, 9, 10, 11, or 12 days. For the clock, We use the 12-hour time format. We display the dates with abbreviated month names and week days names.
Sat, Dec 31, 2050 0:0:0 am Sun, Aug 22, 2049 6:0:0 pm Sat, Apr 11, 2048 12:0:0 pm Sat, Dec 1, 2046 6:0:0 am Sun, Jul 23, 2045 0:0:0 am Sat, Mar 12, 2044 6:0:0 pm
Required options
These options will be used automatically if you select this example.
Set the first calendar date of the sequence.
Set the total length of the date sequence.
Set the delimiter symbol of the date sequence.
Create a sequence of dates in descending order.
Set the interval to increase or decrease dates by.
Set the deviation factor for generating non-linear date sequences.
Use 12hr clock in a sequence.
Use padded dates in a sequence.
Select calendar date format.
Create date format with notation: • YYYY/YY – year • MMMM/MMM/MM – month • dddd/ddd – day of week • DD – day • hh – hour • mm – minute • ss – second
Custom Date Sequence
In this example, we generate a semicolon-separated list of eight custom-format dates. The calendar dates start on 2024-04-24 and they are increased by 1 year, 1 month, and 1 day. We switch to the custom date format mode and create a template "YYYY.MM.DD" for the dates. This template creates the output format that prints the full 4-digit year, followed by a dot, followed by the full 2-digit month, followed by a dot, followed by the full 2-digit day.
2024.04.24; 2025.05.25; 2026.06.26; 2027.07.27; 2028.08.28; 2029.09.29; 2030.10.30; 2031.12.01
Required options
These options will be used automatically if you select this example.
Set the first calendar date of the sequence.
Set the total length of the date sequence.
Set the delimiter symbol of the date sequence.
Create a sequence of dates in ascending order.
Set the interval to increase or decrease dates by.
Set the deviation factor for generating non-linear date sequences.
Use 12hr clock in a sequence.
Use padded dates in a sequence.
Select calendar date format.
Create date format with notation: • YYYY/YY – year • MMMM/MMM/MM – month • dddd/ddd – day of week • DD – day • hh – hour • mm – minute • ss – second
Pro tips Master online time tools
You can pass options to this tool using their codes as query arguments and it will automatically compute output. To get the code of an option, just hover over its icon. Here's how to type it in your browser's address bar. Click to try!
https://onlinetimetools.com/generate-date-sequence?&start-date=2025-01-01%2000%3A00%3A00&count=10&separator=%5Cn&increasing=true&interval=20%20days&fuzzy-interval=0&format=YYYY-MM-DD%20hh%3Amm%3Ass&custom-format=YYYY_MMM_DD_ddd&use-12hr-time=false&padding=true
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.