human
Solve the following python programming problem given the following code:
def _find_promo_themes(count) : 
    promoThemeLifeTime = (((30 * 24) * 60) * 60) 
    now = datetime.now ().date () 
    def filterPromo(t) : 
        dt = t.date 
        if (isinstance (dt, unicode) or isinstance (dt, str)) : 
            dt = datetime.strptime (dt, '%Y-%d-%m').date () 
if ((now - dt).total_seconds () > promoThemeLifeTime) : 
            t.promote = False 
            t.save () 
return t.promote 
themes = filter (filterPromo, Theme.objects.filter (promote = True, moderating = False)) 
    if (len (themes) > count) : 
        themes = sample (set (themes), now) 
return themes 

    
    

    Fix the buggy line: themes = sample (set (themes), now)
assistant
#Here is Python program to fix the buggy line: themes = sample (set (themes), now)
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themes = sample (set (themes), count)