Are you sure they are not talking about zakat al-Fitr? Because this type of Zakat is only paid during Ramadhan and obligatory to pay before Eid. The normal zakah, however, can be paid at anytime of the year. Once you've paid it, keep track of the Islamic year, and when a full Islamic year has passed pay it again. Keep consistent. Ps: Zakah is only paid on savings, not all the money you have.