Why in my Ipad2 calendar does March disappear each time I try to enter he 'month' view?

It's a glitch. Look for any all day event on April 1, for some it's been the holiday Easter Monday. Either delete that all day event or make it last a few hours and March will reappear.

The glitch seems to stem from April 1 being the beginning of Daylight Savings time, but not everyone follows that, so the calendar app gets 'lost' in trying to display March when March's true ending is relative to where you are - for some march 31 is 23 hours long, for others 24.

I have had a similar problem.

It only seemed to start when I entered an all day event on 31st March.

I tried removing the all day event, and all the events on 1st April, but none of these worked.

In the end, the only thing that worked was turning off the UK holiday URL calender.

Surely Apple should fix this issue as opposed to the users deleting or amending their schedules on their devices!!!