I'm embarrassed to admit for as much as I love referencing regs I did not even think to dive into the S1 regs to find the answer for myself.
I feel like this section is oddly worded; however, what I am getting from it is if you have a minimum of 2 years AD as a commissioned officer you are eligible for promotion to CW2 (counts for your time as a WO1). Otherwise its after 18 months as a WO1. Anybody else reading it differently?
That is correct, the full paragraph makes more sense/has more connotation. But they are explicitly saying two years of AD commissioned service equates to DOR for CW2. Full paragraph below (Bold Italics is mine).
3–3. Rules for computing promotion eligibility date to CW2
a. The earlier of the following dates will be the PED to CW2:
(1) The second anniversary of warrant officer service provided the officer has served a minimum of 18 months on the ADL as a WO1. Adjust the PED to ensure the officer meets the 18 months active duty requirement if necessary.
(2) The second anniversary of total active duty service in the current or any higher grade provided that the officer has served a minimum of 18 months of active duty service as a WO1. Adjust the PED to ensure the officer meets the 18 month active duty requirement if necessary. Active duty service as a commissioned officer before appointment as a warrant officer will also count as active duty service. See chapter 2 for determining ADOR.
Note: If a warrant officer is eligible for promotion on 29 Feb and the month has only 28 days, he or she is eligible on 28 Feb.
b. A warrant officer who completes 2 years of warrant officer service before entry on active duty is eligible for promotion on the day of entry. Service must have been in an active reserve status as defined in AR 135–155, paragraph 2–1.
c. Prior AFCS is creditable toward promotion of warrant officers only under a(2), above.