Cal_to_jd()

Converting Calendar Dates to Julian Day Numbers Using PHP Functions

At our website, we have developed a comprehensive guide to help you convert calendar dates to Julian Day Numbers using PHP functions. If you are searching for an efficient and reliable method to convert your calendar dates to Julian Day Numbers, then you have come to the right place.

What is Julian Day Number?

Julian Day Number is a continuous count of days from a specific starting point. It is a numerical representation of a date and time, which is widely used in scientific and astronomical applications. The starting point is January 1, 4713 BC, which is known as the Julian Day Number 0. Any date before this point has a negative Julian Day Number.

Why Convert Calendar Dates to Julian Day Numbers?

Converting calendar dates to Julian Day Numbers is useful in a variety of scientific and astronomical applications. It provides a standard way to represent dates that is not tied to any specific calendar system, making it easier to compare and analyze dates across different time periods and cultures.

How to Convert Calendar Dates to Julian Day Numbers using PHP Functions

At our website, we have developed a simple and effective method to convert calendar dates to Julian Day Numbers using PHP functions. The following PHP functions are used:

• mktime() function to create a Unix timestamp from the given calendar date
• jdtojulian() function to convert the Unix timestamp to Julian Day Number

The PHP code to convert a calendar date to Julian Day Number is as follows:

<?php
$date = '2023-03-02'; //YYYY-MM-DD format
$timestamp = mktime(0, 0, 0, substr($date, 5, 2), substr($date, 8, 2), substr($date, 0, 4));
$jd = jdtojulian($timestamp / 86400 + 2440587.5);
echo $jd;
?>

In the above code, the mktime() function creates a Unix timestamp from the given calendar date. The jdtojulian() function converts the Unix timestamp to Julian Day Number. The result is then displayed using the echo statement.

Conclusion

In conclusion, converting calendar dates to Julian Day Numbers using PHP functions is a simple and effective method that can be used in various scientific and astronomical applications. At our website, we have provided a comprehensive guide to help you convert your calendar dates to Julian Day Numbers using PHP functions. We hope this guide will be useful to you.