EN标准的几个重要日期（DOR, DOA, DOP, DOW）的含义:
可以简单理解为DOP是标准发布日期，可以使用的日期。DOW是本标准强制执行的日期，上一版本标准过期的日期。标准的几个重要日期（ DOR , DOA , DOP , DOW ）的含义：
DOR ( date ofratification )
DOR is the date when the Technical Board confirms that the results of written vote are positive and that the EN / HD is adopted
说明在此日期前 CENELEC 相应的技术委员会核准完成并正式推出；
DOA ( date ofannouncement )
DOA is fixed by the Technical Board , normaly six moths later than dor。
Normally the annoUncement of the existence of the new CENELECEN / ENV / HD is made by each CENELEC member in the officalnational standarS jOUrnal Or in Similar publication at national level。
在此日期前 CENELEC 会员国（包括所有欧盟成员国）必须在国家层面通告上述标准已经制定完成
DOP( date of publication )
DOP is the date limit for indentical / harmonized national standards corresponding to the new EN / HD to be available。
在此旦期前 CENELEC 会员国（包括所有欧盟成员国）必须出版与其同等的国家标准（加上国家差异）或直接将其采用为国家标准；
DOW( date of withdrawel )
在此日期前旧版标准或成员国内部非调和标准停止使用，意味着所有使用就版本标准的检测证书将自动作废。
DOW is the latest date for al CENELEC members to withdraw or amend any nationa standards containing requirements conflicting with those of the new HD or EN , even if the publication of anew national standard on the basis of an HD is not intended.
(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved
(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat
(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level
(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement
(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn
(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.
In the case of undated standard, a link to the last dated version is provided.
In the case of series, a link to each standard identified in the series is provided.
We also invite you to check (via the website) whether corrigenda and/or amendments shall be read in conjunction with the main standard.
(7) Estimated dates to be confirmed at the publication of the standards.
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