# 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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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**

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.

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**

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.

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**

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.

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

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.

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