Date of judgment

// start time information 
String mStrStarTime = "2019-01-01"; 
// end time information 
String mStrEndTime = "2020-01-01"; 
// Start and end dates logic determination 
int mPlanTime = (mStrStarTime) .compareTo ( mStrEndTime); 
end // call time is less than the start time 
IF (mPlanTime> mPlanTime == 0 || 0) { 
    new new SnackbarUtil.SnackbarBuilder (mContext, "start time should be less than the end time") the .Show (); 
    return; 
}