31st Day of Month not selecting properly with Custom Format.

[Murray1313]

Using the following Date Format: (D hh:mm A) I tried to select the 31st day of a month and it switches it to the 1st. I was able to work around the issue by adding "M" to my format, but this is still unexpected behavior. The issue can be replicated in the demo moment picker: https://indrimuska.github.io/angular-moment-picker/.