Check here if respondent does not know month.

FFQ180. Since what month and year have you been using {curr_mthd_calc_lab} without stopping? Most Recent Birth: {recent_birth_date_lab} Current Marriage: {living_start_cmy_lab}

Calculate backwards from memorable events if needed. Must be before today. Respondent must be at least 10 years old. Select ?Do not know? for month and ?2030? for year to indicate ?No Response?.
For RE: Mark start date and all months until now as current use on the visual aid

Date cannot be in the future and respondent must be at least 10 years old.

Do not know month