You cannot assign an int primitive to a string. assuming your getFHour() and getFMin() returns int. try:
msg1+=getFHour();
msg2+=getFMin;
OR, you can also convert an int to a string with Integer.toString() method.
msg1=Integer.toString(getFHour());
msg2=Integer.toString(getFMin);
However you should be using SimpledateFormater to format Dates and Time