Setting min/max on datetime component does not work with 12-hour clock; am/pm column.

[ionitron-bot]

Ionic version: (check one with "x")
[ ] 1.x
[x] 2.x

I'm submitting a ... (check one with "x")
[x] bug report
[ ] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://forum.ionicframework.com/ or http://ionicworldwide.herokuapp.com/

Current behavior:
Use 12-hour time with a am/pm column, and min/max time, e.g.

<ion-datetime displayFormat="hh:mm a" min="01:20" max="13:45"></ion-datetime>

Hours/minutes columns are not shown.

Expected behavior:
Hours/minutes columns should be displayed and limited to 01:20 am and 01:45 pm.

Other information:
I was working on a pull request that allowed specifying a min/max time. My code was obviated by ionic-team/ionic-framework@afd99ba

I have some insight into how to fix.

1. You will need to adjust the 12 hour clock to run from 12 to 11 rather than from 1 to 12. I.e. [12, 1, 2, 3, ..., 10, 11]

2. You will need to check am/pm min/max values before checking hour values, i.e. between day and hour.

I am happy to contribute a pull request that does this, but it will take me a few days because my old code is now incompatible with the new approach.

Thanks!