a. The promotion starts/is effective on the 4th of June.<br/>b. The promotion starts/is effective on 4 June<br/><br/>c. The promotion starts/is effective on June 4th<br/>d. The promotion starts/is effective on June 4<br/><br/>e. The promotion is effetive 4 June<br/>e. The promotion is effetive June 4<br/><br/>Which of these are grammatically correct?<br/>Which is the best way to say this in a formal context?<br/><br/>Thank you