At this time, i have yet found a way to convert from Solar to Lunar and vice-versa.

Information i have gathered currently shows that the lunar date is using movements of the moon which is someone irregular and only has consistency that may only lasts for 100 years. At this time, so far lunar dates which is the Nong Li (which current chinese new year is celebrated) is gathered from the astronomical observatory. eg in hong kong.

There are some basic information that one should understand. And these are rules that one should not be confused about.

1) The chinese calendar uses both Solar (Sun) and Lunar (Moon) phases to calculate the date. Thus its commonly known as a Luni-Solar Calendar.

2) There are 2 month cycles in the chinese calendar. One uses Solar (Sun) positions to calculate and the other uses moon phases to calculate.

3) Bazi uses only the solar calculation. and Zi wei dou shu on the other hand uses both the solar and lunar months.

4) Gregorian calendar is the current western calendar that is acknowledged universally. And most birth dates uses this.

5) The solar month will result the year starting at the 4th or 5th of gregorian Feb.

6) Lunar Month Phase Chinese Calendar is also known as Nong Li (Farmers Almanac), Chinese Lunar Calendar.

7) Solar Month Phase Chinese Calendar is also known as Min Li (Public or Commoners Calendar).

for more rules, please refer to chineseastrologyonline.

Calendar with the following characteristics:
1. Average year of 365 days (52 weeks +1 day), a leap year 366 days (52 weeks +2 days). Average year on February 28 days, February 29 leap year days.
As a result of the year as January 1, Saturday, March 1 it was Wednesday. – Pay attention to the “three”
In order to achieve the most simple algorithm, so this algorithm to “a week” for the unit. And election of March 1 as the base month.
2. Every 400 years tenths of the whole or every 4 years for a hundred years not a leap. (Reasons for this: the Earth around the sun a week is 365 days 5 hours 46 seconds, in order to make the number of days a year as an integer, the number of days to a year for 365 days, and the remaining time up to four years is 23 hours 15 minutes 4 seconds, nearly a day, that day in a particular year increase from 29 days in February, known as a leap year that year, other years as the average year. However, four years plus a day spent another 44 minutes and 56 seconds, the number of flooded 400 for three years. So 400 years a leap year only 97, so who can be divisible by 400, or can not be divisible by 100 but can be divisible by 4 years as a leap year.)
So a hundred years% 4 = 0 Darun or (year% 4 = 0 and in <> 0) leap.
3. Every 4 years (3 months average year a leap year +1) a total of 208 weeks +5 days – to pay attention to this “5 days”
A total of 100 * for every hundred years (208 weeks +5 days) -1 days +5 days = 5217 weeks – to pay attention to this “5 days” (temporarily for centuries as a whole an average year)
Every 400 years a total of 4 * (5217 weeks +5 days) +1 days (the entire 400-year leap) = 20,871 weeks +0 days – note the “0 days” and
“1 day” (the whole four years there is only one leap year)
That is, a reincarnation 400 years! (The original calendar is a 400 years ago)

by MG Lim

References

National University of Singapore

http://www.math.nus.edu.sg/aslaksen/calendar/cal2.pdf

http://www.math.nus.edu.sg/aslaksen/calendar/chinese.html#dragon

http://chineseastrologyonline.com/clc/LunarCalendar.htm