Who could explain for me what's the difference between "en" and "dans" in French? Thanks in advance... Who could explain for me what's the difference between "en" and "dans" in French? Thanks in advance... For example: en 8 jours=within 8 days; dans deux ou trois jours=in 2 or 3days; but is there any difference? or we also could say dans 8jours/en deux ou trois jours?