Update column if submission time didnt exceed more than 15 minutes of deadline time - android-sqlite

Question

What im after is to update the rows of table2 remark column. So if i have 10:00 as deadline time, the submission time must be between 10:00 - 10:15 so that it will be declared as ONTIME. Once it exceeds 15 minutes it will automatically update as LATE
Here are the tables below:
Table 1
id | deadline_time
------------------------------
1 | 10:00
Table 2
id | remark | time_submitted
----------------------------
1 | ONTIME | 10:14
2 | LATE | 10:20
Here is what i've tried so far: its just the idea of how i can compare the time.
public void checkTime(){
String a = "10:00";
String b= "10:15";
SimpleDateFormat format = new SimpleDateFormat("HH:mm");
Date x = null;
Date y = null;
try{
x = format.parse(a);
y = format.parse(b);
long diff = y.getTime() - x.getTime();
long min = diff / (60* 1000) % 60;
long hours = diff / ( 60 * 60 * 1000) % 60;
Log.d("Difference: ", "Hours: "+hours + "Minutes: "+min);
} catch(Exception e){
e.printStackTrace();
}
}
Im having trouble on creating sqlite statement for this one. Some ideas please to construct sqlite for this please! Also how can i compare the time_submitted if has a lot of data with just a single data from deadline_time column?

Answer 1

What i did was get the difference between String a and String b. Then checked if the difference is greater than 15 then i will update the remark to LATE and ONTIME if not.
public void checkTime(){
Database hander = new Datababase(this);
SQLiteDatabase db = handler.getWritableDatabase();
String a = "10:00";
String b= "10:30";
SimpleDateFormat format = new SimpleDateFormat("HH:mm");
Date x = null;
Date y = null;
try{
x = format.parse(a);
y = format.parse(b);
long diff = y.getTime() - x.getTime();
long min = diff / (60* 1000) % 60;
long hours = diff / ( 60 * 60 * 1000) % 60;
if(min > 15) {
db.execSQL("UPDATE table SET remark = 'LATE' WHERE id="2");
} else
db.execSQL("UPDATE table SET remark = 'ONTIME' WHERE id="2");
} catch(Exception e){
e.printStackTrace();
}
}