Solar Calendar
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.
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