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Custom calendar date generator

World's simplest time tool

With this browser-based application, you can create a list of custom calendar dates with a specific format and strict constraints. You can set the allowed values and ranges for every calendar component – years, months, days, hours, minutes, and seconds, and generate unique calendar dates, create custom date templates, and if the date has a specific time, select 12-hour or 24-hour clock format. Created by computer nerds from team Browserling.
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Date Component Values
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Count, Delimiter, Duplicates
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Date and Time Format
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
• YYYY/YY – year • MMMM/MMM/MM – month • dddd/ddd – day of week • DD – day • hh – hour • mm – minute • ss – second
Custom calendar date generator tool What is a custom calendar date generator?
This is a quick online utility for generating custom calendar dates that match a specific set of parameters. For example, you can generate ten dates with the month being April or June and the days being 10 to 20. Some of such dates are 1999-04-10, 2025-06-20, and 2033-04-20. Another example could be generating calendar years on the 5th day of every month. Such dates are: 2022-09-05, 2030-12-05, 2007-11-05. You can specify the required number of dates in the options and also adjust the symbol for separating them. By default, the dates are separated by a new-line symbol that puts each date on a separate line but you can also set this symbol to a vertical pipe, a hash, or a dot. Each date component can be configured individually by specifying an interval of valid values for it. For example, the interval "9-12" for the days will only select the 9th, 10th, 11th, and 12th calendar day. The single choice value "9, 12" will only generate those two days, and the mixed value "9-11, 15" will generate the 9th, 10th, 11th, and 15th day. If you don't care what the day of the week is in the date, then you can enter an asterisk symbol "*" in the option or leave the option empty. Similarly, if you leave the month field empty, the program will select any month from 1 to 12. If you don't specify the year, the algorithm will generate any year from 2000 to 2100. If you leave the clock time blank, the hours will be chosen from the range 0 to 23, and the minutes and seconds from the range 0 to 59. You can change the date and time format by choosing from a variety of predefined formats in the format selection list, switching between 12-hr and 24-hr time formats, and controlling zero padding for all date parts. You can also make a custom calendar date template by selecting the custom mode from the format selection list. In this mode, you can enter date patterns using the special YYYY, YY, MM, DD, hh, mm, ss abbreviations. For example, the "ddd + YYYY_MM_DD" pattern will generate dates like "Sat + 2000_12_02". You can also enable or disable the option that allows repeated dates, thereby allowing or forbidding the algorithm to randomly choose the same date twice for the output list. Timeabulous!
Custom calendar date generator examples Click to use
Ten Custom Calendar Dates
In this example, we create ten custom calendar dates. The generated dates have the years ranging from 2020 to 2040, the months ranging from 04 to 05 (i.e. April or May), the days randing from 10 to 20, the hours ranging from 10 to 12, the minutes being either 30 or 40, and the seconds being either 10 or 50.
2039-04-11 10:40:50 2026-04-12 11:30:50 2038-04-18 12:40:10 2027-05-10 10:30:50 2020-04-12 11:30:50 2027-04-19 10:40:50 2038-04-20 11:40:10 2021-04-20 10:30:50 2039-05-19 11:30:10 2027-04-14 12:30:10
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
Custom Dates From the Same Year
In this example, we generate six custom dates all within the same year 2050. We allow any values for months, days, and clock time, and we switch to the am/pm clock format (the 12-hour clock format). We also turn off the option that allows generating duplicate dates, i.e. only unique dates are printed. We choose the format "MM/DD/YYYY hh:mm:ss" for the output list.
02/05/2050 08:07:47 pm 08/23/2050 07:37:41 am 07/27/2050 11:01:55 am 08/01/2050 08:27:18 pm 04/30/2050 10:13:00 pm 07/10/2050 02:55:44 am
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
Our Own Date Template
In this example, we create custom dates using our own date template. In our template, we skip the clock time part of the dates and add the abbreviated three-letter name of the day of the week. We only allow two possible values for the year (1990 or 2000), two values for the date (1 or 12), and two values for the day (2 or 22). In total, we generate 8 random dates and print them separated by a vertical bar character.
Sat, 22.01.2000 | Fri, 22.12.2000 | Fri, 22.12.2000 | Sun, 02.01.2000 | Sun, 02.01.2000 | Tue, 02.01.1990 | Sun, 02.01.2000 | Sat, 02.12.2000
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
Binary Calendar Dates
In this example, we create a binary calendar with binary dates. Binary dates are magic dates that consist of only two digits "1" and "0". To create all such dates, we enter all combinations of binary date and time parts in the options. We generate eleven binary dates and place them in a vertical column.
1011-11-01 11:10:00 1111-01-10 10:01:00 1010-01-10 01:11:00 1011-01-01 10:00:00 1110-10-11 01:11:01 1100-10-01 00:11:01 1111-11-01 10:11:00 1001-11-01 11:10:00 1111-01-01 01:10:10 1101-11-01 10:11:11 1000-01-01 00:01:11
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
Double Digit Dates
In this example, we create dates in a custom format from duplicate 1s and 2s. We allow two such values for the year (1111 and 2222), one value for the month (11), and two values for the day (11 and 22). We print 5 random dates formatted as "YYYY ~ MM ~ DD".
1111 ~ 11 ~ 11 2222 ~ 11 ~ 22 2222 ~ 11 ~ 22 1111 ~ 11 ~ 11 1111 ~ 11 ~ 22
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
Love for Twos
This example was created by a person who really loves the number two. He used our application to create custom calendar dates that contain a lot of 2's and some 0's. He used a predefined set of numbers for each date component and generated eight random calendar dates from these numbers.
02-02-2200 22:02:20 02-02-2222 22:20:20 02-02-2222 02:02:20 02-20-2220 22:20:22 02-02-2022 02:02:02 02-02-2222 02:20:22 02-22-2020 22:22:22 02-02-2020 22:20:22
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
The Half Calendar
In this example, we generate calendar dates that all happen within the first half of each time unit. The year is limited to the first half of the 21st century. The month is limited to the first half of the year, and the day is limited to the first half of the month.
2040/03/03 2020/05/03 2044/03/04 2033/02/13 2031/05/06
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Specify custom format pattern.
Odd Calendar Dates
This example creates a list of odd calendar dates from the year 2021 to the year 2029. In this list, every time component has an odd value. The years are odd, the months are odd, the days are odd, the hours are odd, the minutes are odd, and the seconds are odd. And the list itself also contains an odd number of dates. That's odd.
2021-11-11 11:39:07 2025-01-01 19:31:45 2023-09-11 23:39:19 2027-11-13 11:11:47 2027-03-29 17:11:05 2029-11-15 17:39:51 2021-05-29 07:53:19
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
Calendar from the Future
We believe that in the year 3000 the calendars will be simplified and all dates will have the same number of months, days, hours, minutes, and seconds. To demonstrate how such calendars will look we generated a dozen of dates from this year. The months, days, hours, minutes, and seconds are all restricted to the range of 1 to 12.
10-07-3000 07:02:04 01-01-3000 08:07:12 06-03-3000 08:02:03 08-12-3000 02:11:11 01-01-3000 03:01:06 03-08-3000 01:07:04 01-05-3000 01:04:01 08-05-3000 11:10:02 10-03-3000 07:03:03 04-02-3000 05:10:11 11-03-3000 03:03:09 05-05-3000 07:11:11
Required options
These options will be used automatically if you select this example.
Specify years range.
Specify months range.
Specify days range.
Specify hours range.
Specify minutes range.
Specify seconds range.
Set custom date count.
Set a delimiter character for the output custom dates.
If this option is selected, then there is a chance that the same date can be generated multiple times.
Display time in 12hr format.
Display all dates in full width.
Select custom date format.
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-custom-calendar-dates?&count=10&years-range=2020-2040&months-range=04-05&days-range=10-20&hours-range=10-12&minutes-range=30%2C%2040&seconds-range=10%2C%2050&repetitions=true&format=YYYY-MM-DD%20hh%3Amm%3Ass&custom-format=YYYY_MM_DD&use-12hr-time=false&padding=true&separator=%5Cn
All time tools
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Quickly visualize your life in weeks or months.
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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.
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