Those participating in the Pioneer Total Abstinence Association (PTAA) sign a pledge to abstain from alcohol for life or a limited amount of time. (See http://www.iol.ie/%7Econnaughtpioneers/prayer.html)
Alcoholics Anonymous does not require a formal (signed) pledge but does suggest that the newcomer abstain from alcohol "one day at a time." Among other suggestions by AA to help the newcomer abstain from alcohol "one day at a time" is to attend 90 meetings in 90 days.