By when vessel has to enter dry dock?

How we can check by which date vessel has to enter dry dock?  Let's see Class NK vessel for example.

There are some types of Class Survey, please see below brief summary table. 

船級検査 (Class Survey)	定期検査	中間検査	年次検査	ボイラ検査	船底検査※2	プロペラ軸及び船尾管軸の検査
	Special Survey (SS)	Intermediate Survey (IS)	Annual Survey (AS)	Boiler Survey (BS)	Docking Survey (DS)※2	Propeller Shaft Survey (PS)
期限 (Period)	5年毎 （有効期間が満了する日の3ヶ月前から満了する日までの間）	2回目 or 3回目の年次検査の時期に実施	毎年 （検査基準日※1の前後3ヶ月以内のいずれかに実施）	前回の検査から36ヶ月 + 定期検査時	前回の検査から36ヶ月 + 定期検査時	5年 （部分検査で開放検査延期可能※3）
	5 yearly (Within 3 month before the date of expiry of the certificate of classification)	Second of Third annual survey	Annually (Within three months before or after each anniversary date※1)	Within 36 months from the date of completion of the classification survey or the previous docking survey + Concurrently with special survey	Within 36 months from the date of completion of the classification survey or the previous docking survey + Concurrently with special survey	5 yearly (Partial survey can be applied instead of open-up survey※3)
入渠の必要性 (Dry Dock)	〇	×	×	×	〇	〇
※1 : 船級証書の有効期間の満了日に相当する毎年の日         The day corresponding to expiry date of the Classification certificate ※2 : 原則として建造後15年未満の船底検査については、船級符号 "IWS" (In Water Survey)の付記を有する船舶は入渠せずに水中検査とすることができる。ただし水中検   査を連続して行うことはできない。 　　In principal, In-water survey may be accepted in lieu of Docking survey in the dry dock for ships up to 15 years old in according to the approved plans and documents. Consecutive In-water survey is not accepted. ※3 : プロペラ軸の種類による         Depend on kind of propeller shaft

Types of class survey with '〇' in the cell ’Dry Dock’ is required to enter dry dock for the survey.  Thus, dry dock due date is the earliest date of Special Survey, Docking Survey and Propeller Shaft Survey.