What day is today? 今天是星期几？

1.What day is today? 今天是星期几？ 
2. Today is Monday. 今天是星期一。
3. What month is this? 现在是几月份？ 
4. This is January. 现在是一月份。  
5. I was in the hospital for several weeks. 我在医院里住了几个星期。