What does it mean that one day would be like one year during Dajjal's reign?

I have read the complete story of how Dajjal would come and rule over the whole world except for mecca and medina It is also mentioned that these 40 days would be different then other days because the one day would be like one year, next one would be like one month, next one would be like one week and remaining 37 days would be normal days. As it is mentioned that one day from 40 days would be like one year, **does it mean that the whole day from morning to night will complete in one year?**