When users set a time in the ampm format, and you have an altField set to then format it back to 24 hour time, the conversion doesn't take into account pm. for example if you select a 3:15pm, it converts it to:
when it should convert it to:
$("#ship_display").datetimepicker
ampm: true
altField: "#shipment_ship_date"
altFormat: "yy-mm-dd"
altFieldTimeOnly: false
altTimeFormat: "hh:mm:00"