Calendar view Missing dates - Critical Bug

[ziacto]

Calendar view contains the big issue for showing the current month all dates.

For example, if week start from Sunday and month has 31 dates then some how calendar shows 29 dates and next two dates will not show and if the user clicks on next month and now the month is changed and the user can not select 30 and 31 day.Which is a critical bug? How can I fix this issue?

Urgent Solution required for app :(