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Introduction
Use this PHP class to create a monthly calendar. It's easy to use and highly customizable,
supports multiple languages, and you can choose whether weeks start with Saturday, Sunday,
Monday, or any other day. Of course you can create as many calendars as you like. Have a
look at the example below. It shows five calendars; the current month (big in the middle)
plus the two previous months (left) and the two next months (right):
Example:
| April 2025 | | Su | Mo | Tu | We | Th | Fr | Sa | | | | | 1 | 2 | 3 | 4 | 5 | 14 | | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 15 | | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 16 | | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 17 | | 27 | 28 | 29 | 30 | | | | 18 |
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| May 2025 | | Su | Mo | Tu | We | Th | Fr | Sa | | | | | | | 1 | 2 | 3 | 18 | | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 19 | | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 20 | | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 21 | | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 22 |
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| June 2025 | | Su | Mo | Tu | We | Th | Fr | Sa | | | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 23 | | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 24 | | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 25 | | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 26 | | 29 | 30 | | | | | | 27 |
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| July 2025 | | Su | Mo | Tu | We | Th | Fr | Sa | | | | | 1 | 2 | 3 | 4 | 5 | 27 | | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 28 | | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 29 | | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 30 | | 27 | 28 | 29 | 30 | 31 | | | 31 |
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| August 2025 | | Su | Mo | Tu | We | Th | Fr | Sa | | | | | | | | 1 | 2 | 31 | | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 32 | | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 33 | | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 34 | | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 35 | | 31 | | | | | | | 36 |
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In 1582, Gregory XIII made a calendar reformation (advanced leap year rules + 10 days have
been dropped in October) and created the Gregorian calendar, which is in use since then.
Therefore HTML-Calendar applies the Gregorian calendar for years > 1582, and the old Julian
calendar for years <= 1582.
Regarding week numbers, HTML-Calendar applies the following rules:
- One week consists of 7 days.
- The first week of a year must contain at least 4 days, or else it will appear
as last week of the previous year. This may vary depending on the day that starts
the week (Saturday, Sunday, Monday...).
Important note for users of older HTML-Calendar versions
In version 2.7, two variables were removed: tdFontColor and tdBGColor. They
were replaced by a new variable tdBorderColor. This has been done because the current
day (today) is now just marked by a border, leaving font color and background color unchanged.
Be sure to update any scripts that use HTML-Calendar accordingly. Sorry for the inconvenience.
Change Log
Version 2.17
* Refactored code for PHP 8.
Version 2.16
* Fixed events on specific weekdays in leap years.
Version 2.15
* Fixed week numbers in year 1582.
* Fixed events on specific weekdays in October 1582.
Version 2.14
* Send date in YYYY-MM-DD format when day is clicked.
* Added possibility to view events on specific weekdays.
Version 2.13
* Fixed calendar when only one week is selected.
Version 2.12
* Added support for multiple events within the same time period.
* Added possiblity to set link target.
Version 2.11
* Added support for links with parameters.
Version 2.10
* Added possibility to view only a certain week.
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