Yii Ejuidatetimepicker

I have an entry module for user's shift which you have to set the start and end time of shift.

The website is now being used in Vietnam. I'm using EJuiDateTimePicker for the selection of start and end time.

The problem is that am is sa and pm is ch.

Now when my action read the values using my model, what I retrieve is like these:

• for start time - 1:30 ch (which is 1:30 pm supposedly)
• for end time - 2:30 ch (which is 2:30 pm supposedly)

and when I hit save, I received this error:

DateTime::__construct(): Failed to parse time string (03:45 ch) at position 6 (c): The timezone could not be found in the database

My timeformat for the picker is hh:mm tt.

Is there a way for me to retrieve the times in am or pm not in sa or ch? or a way where I can convert the time I retrieved to am or pm?