hahaha, all the answers u got are wrong!
New UOB One Card- Singapore's most generous card was launched on 9 Aug 2015, national day. All new cardholders will enjoy the new rebates immediately. Existing cardholders will only get to enjoy the new rebates from Oct 1 2015 (see FAQ for details).
From my experience, my card was approved in May 2015 with statement date June 12. My quarter was May, June, July with "first" statement on June 12 and final statement on July 12. I received 2/3 of rebates on Aug 12. When I get my card in May, UOB already eaten up 1 mth (ie April to May 12), so only need to spend for May 13 to June 12 cycle.
So if u apply for your card this mth, assuming approved on 9 Sept, your quarter will be Sept Oct Nov, u start spending for Oct mth from date u receive your card to 9 Oct (uob takes approval date as statement date). Shld uob use your existing card's statement date, ie 23 Sept, then u have less time to clock the spend of say $2k to get $300 rebate per qtr. If u can hit 2k for Oct and Nov, u get 2/3 of rebate (ie $200), if u can only hit 2k in Nov, u get 1/3 of rebate.
hahaha, good luck!