JavaScript lunar calendar conversion

With the rapid development of the world, our lives are becoming more and more convenient, and network technology is becoming more and more mature. However, in some aspects, we still need to rely on traditional knowledge and skills to help us solve problems. For example, in daily life, we often need to convert the lunar calendar into the solar calendar, but this conversion process is actually quite cumbersome. But it doesn’t matter. In this article, we will introduce how to use JavaScript to convert the lunar calendar to the solar calendar, making the process easier.

First of all, we need to clarify how to convert solar calendar dates to lunar calendar dates. The traditional lunar calendar is a calendar calculated based on the phases of the moon and the solar calendar. It is also a traditional timekeeping unit in Chinese culture. In China, people usually use this calendar to determine important dates such as lunar festivals and lunar birthdays. However, due to the complexity and unwieldy nature of its calendar system, direct conversion is difficult. Therefore, we need to use some modern technology to help us complete this process.

JavaScript is a scripting language used for web development, which can perform interactive and dynamic design on web pages. With the help of JavaScript's date object (Date), we can easily obtain the current date, time, week, month and other information. In JavaScript, we can create a Date object and use it to represent a date and time. The syntax of the Date object is as follows:

var date = new Date();

This statement will create a Date object, which represents the current date and time. If we want to get the Date object of a specific date, we can use the following syntax:

var date = new Date(year, month, day, hours, minutes, seconds, milliseconds);

Among them, year represents the year; month represents the month, and the value range is 0-11, 0 represents January, 11 represents December; day represents the date, the value range is 1-31; hours represents the number of hours, the value range is 0-23; minutes represents the number of minutes, the value range is 0-59; seconds represents the number of seconds, the value range is 0-59; milliseconds represents the number of milliseconds, and the value range is 0-999. Note that the last parameter can be omitted. If omitted, the number of milliseconds defaults to 0.

Next, let’s introduce how to use JavaScript to convert the lunar calendar. First, we need to know the correspondence between the lunar calendar and the solar calendar. The lunar calendar is calculated based on the phases of the moon and the solar calendar, which is based on the Earth's revolution period around the sun. Therefore, we need to first determine what day of the year today is, and then use some rules to calculate the date of the lunar calendar.

First, we need to define an array to store the number of lunar days in each year. Each bit of the array indicates whether the year is a leap year. If it is 0, it is not a leap year. If it is 1, it is a leap year. Because the number of days in each lunar month is not fixed, we need to calculate the number of days in each lunar month based on this array.

var lunarMonths = [
    0x04bd8,   // 1900
    0x04ae0,
    0x0a570,
    0x054d5,
    0x0d260,
    0x0d950,
    0x16554,
    0x056a0,
    0x09ad0,
    0x055d2,
    0x04ae0,
    0x0a5b6,
    0x0a4d0,
    0x0d250,
    0x1d255,
    0x0b540,
    0x0d6a0,
    0x0ada2,
    0x095b0,
    0x14977,
    0x04970,
    0x0a4b0,
    0x0b4b5,
    0x06a50,
    0x06d40,
    0x1ab54,
    0x02b60,
    0x09570,
    0x052f2,
    0x04970,
    0x06566,
    0x0d4a0,
    0x0ea50,
    0x06e95,
    0x05ad0,
    0x02b60,
    0x186e3,
    0x092e0,
    0x1c8d7,
    0x0c950,
    0x0d4a0,
    0x1d8a6,
    0x0b550,
    0x056a0,
    0x1a5b4,
    0x025d0,
    0x092d0,
    0x0d2b2,
    0x0a950,
    0x0b557,
    0x06ca0,
    0x0b550,
    0x15355,
    0x04da0,
    0x0a5b0,
    0x14563,
    0x092e0,
    0x0c960,
    0x0d954,
    0x0d4a0,
    0x0da50,
    0x07552,
    0x056a0,
    0x0abb7,
    0x025d0,
    0x092d0,
    0x0cab5,
    0x0a950,
    0x0b4a0,
    0x0baa4,
    0x0ad50,
    0x055d9,
    0x04bd0,
    0x0a4d0,
    0x0d8d7,
    0x0d250,
    0x0d520,
    0x0dd45,
    0x0b5a0,
    0x056d0,
    0x055b2,
    0x049b0,
    0x0a577,
    0x0a4b0,
    0x0aa50,
    0x1b255,
    0x06d20,
    0x0ada0,
    0x14b63
];

Next, we need to define an array to store the lunar calendar date corresponding to the solar calendar date of the first day of each year from 1900 to 2050. Because this array stores data with a leap month as a symbol, we need to use a binary value to indicate which month of the year is a leap month, or 0 if there is no leap month.

var lunarInfo = [
    0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2, // 1900-1909
    0x04ae0,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,0x04970, // 1910-1919
    0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,0x06566, // 1920-1929
    0x0d4a0,0x0ea50,0x06e95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,0x0d4a0, // 1930-1939
    0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,0x06ca0, // 1940-1949
    0x0b550,0x15355,0x04da0,0x0a5b0,0x14563,0x092e0,0x0c960,0x0d954,0x0d4a0,0x0da50, // 1950-1959
    0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,0x0a950,0x0b4a0,0x0baa4,0x0ad50, // 1960-1969
    0x055d9,0x04bd0,0x0a4d0,0x0d8d7,0x0d250,0x0d520,0x0dd45,0x0b5a0,0x056d0,0x055b2, // 1970-1979
    0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0,0x14b63,0x09370,0x04970, // 1980-1989
    0x064b0,0x0d4a0,0x1d8a7,0x0d550,0x0d6a0,0x0dea2,0x0a5b0,0x055d4,0x052d0,0x0a9a8, // 1990-1999
    0x0e950,0x06aa0,0x1a6c4,0x0aae0,0x0a2e0,0x0d2e3,0x0c950,0x0ca50,0x0da50,0x05aa4, // 2000-2009
    0x056d0,0x0adb8,0x025d0,0x092d0,0x0cab6,0x0a950,0x0b4a0,0x0baa0,0x0ad50,0x05550, // 2010-2019
    0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60, // 2020-2029
    0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,0x05aa0,0x076a3,0x096d0,0x04dd5,0x04ad0, // 2030-2039
    0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577, // 2040-2049
    0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0aea0,0x1a5b6,0x052b0,0x0a930,0x07954,0x06aa0, // 2050
];

Then, we need to write a function to calculate the lunar date based on the given solar calendar date. The implementation process of this function is relatively cumbersome. The general idea is to first determine which year, month and day the current solar calendar date is in, and then calculate it according to the relevant rules of the lunar calendar. I won’t explain it in detail here. Interested readers can look up the information for in-depth study.

Finally, we need to render the obtained lunar date into the web page. The specific approach can be to use HTML and CSS for design, and set styles and layout according to different needs.

In short, with the help of the powerful function of JavaScript, we can easily realize the conversion of the lunar calendar to the solar calendar, which makes it easier for us to better record and manage our lives. At the same time, we can also broaden our skills and improve our competitiveness by learning JavaScript.

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