diff --git a/data.json b/data.json
new file mode 100644
index 0000000..901317d
--- /dev/null
+++ b/data.json
@@ -0,0 +1,51 @@
+{
+    "Arch": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 86400,
+        "csc": "archlinux/",
+        "upstream": "http://arch.mirror.constant.com/",
+        "file": "lastupdate"
+    },
+    "Ceph": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 86400,
+        "csc": "ceph/",
+        "upstream": "https://download.ceph.com/",
+        "file": "timestamp"
+    },
+    "Debian": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 86400,
+        "csc": "",
+        "upstream": "https://ftp-master.debian.org/",
+        "file": "debian/project/trace/master"
+    },
+    "Eclipse": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 172800,
+        "csc": "eclipse/",
+        "upstream": "http://download.eclipse.org/",
+        "file": "TIME"
+    },
+    "GNU": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 86400,
+        "csc": "",
+        "upstream": "https://mirrors.kernel.org/",
+        "file": "gnu/mirror-updated-timestamp.txt"
+    },
+    "Kernel": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 86400,
+        "csc": "kernel.org/",
+        "upstream": "https://mirrors.edge.kernel.org/pub/",
+        "file": "linux/kernel/next/sha256sums.asc"
+    },
+    "OpenBSD": {
+        "out_of_date_since": null,
+        "out_of_date_interval": 86400,
+        "csc": "",
+        "upstream": "https://ftp.openbsd.org/pub/",
+        "file": "OpenBSD/timestamp"
+    }
+}
diff --git a/main.py b/main.py
index 54699db..eb32afd 100644
--- a/main.py
+++ b/main.py
@@ -4,6 +4,7 @@
 This mirror status checker determines whether CSC mirror is up-to-date with upstream
 """
 
+import time
 import requests
 from arch import Arch
 from ceph import Ceph
@@ -51,11 +52,33 @@ if __name__ == "__main__":
             distro.print_output(distro.check())
         except requests.exceptions.RequestException as err:
             print(f"Error: {distro.name()}\n{err}")"""
-    
-    distros = json.load(open('distros.json',))
+
+    """distros = json.load(open('distros.json',))
     print(distros)
 
     for distro in distros:
         print(distro[0] + ":")
         print("CSC mirror: " + checker(distro[1], distro[3]))
-        print("Official distro: " + checker(distro[2], distro[3]))
\ No newline at end of file
+        print("Official distro: " + checker(distro[2], distro[3]))"""
+
+    with open("data.json", "r", encoding = "utf-8") as file:
+        data = json.load(file)
+        current_time = int(time.time())
+        for distro in data:
+            csc_url = "http://mirror.csclub.uwaterloo.ca/" + data[distro]["csc"] \
+                + data[distro]["file"]
+            upstream_url = data[distro]["upstream"] + data[distro]["file"]
+            try:
+                if requests.get(csc_url).text == requests.get(upstream_url).text:
+                    data[distro]["out_of_date_since"] = None
+                elif data[distro]["out_of_date_since"] is None:
+                    data[distro]["out_of_date_since"] = current_time
+                elif current_time - data[distro]["out_of_date_since"] \
+                    > data[distro]["out_of_date_interval"]:
+                    print(f"Failure: {distro} out-of-sync")
+                    continue
+                print(f"Success: {distro} up-to-date")
+            except requests.exceptions.RequestException as err:
+                print(f"Error: {distro}\n{err}")
+    with open("data.json", "w", encoding = "utf-8") as file:
+        json.dump(data, file, indent = 4)