The woman's conception month in the Chinese Baby Gender Prediction Chart is the Chinese lunar month. If you want to know the first day of a Chinese Lunar Month for the coming year, then you just need to select the Year and the Time Zone in the following tool and the Chinese Lunar Months will be listed in the western Gregorian date format. This can help women to choose the conception month.
Usually, Chinese Lunar Calendar is slightly different for each time zone. If you choose the date of the conception month in the middle of the lunar month, then you won't miss the lunar month.
The China Civil Calendar is the official China calendar, which is the East Longitude 120 degree time. For US and European time zones should select Astronomical Calendar. The biggest difference between Civil Calendar and Astronomical Calendar is the Lunar Leap Month assignments.