Update daily update check workflow to run at 3 AM UTC and modify date check from second-to-last day to yesterday

Author: willyfromtheblock

.github/workflows/check_updates.yml

@@ -2,7 +2,7 @@ name: Check Updates
 
 on:
   schedule:
-    - cron: "0 0 * * *" # Runs every day at midnight UTC
+    - cron: "0 3 * * *" # Runs every day at 3 AM UTC
 
 jobs:
   check_updates:
@@ -16,13 +16,13 @@ jobs:
         run: |
           curl -o optimalfraction.json https://charts-core.peercoinexplorer.net/optimalfraction.json
 
-      - name: Check if the second-to-last day is included
+      - name: Check if yesterday is included
         run: |
           TODAY=$(date -u +"%Y-%m-%d")
-          SECOND_LAST_DAY=$(date -u -d "$TODAY - 2 days" +"%Y-%m-%d")
-          if grep -q "$SECOND_LAST_DAY" optimalfraction.json; then
-            echo "The second-to-last day ($SECOND_LAST_DAY) is included in the JSON data."
+          YESTERDAY=$(date -u -d "$TODAY - 1 day" +"%Y-%m-%d")
+          if grep -q "$YESTERDAY" optimalfraction.json; then
+            echo "Yesterday ($YESTERDAY) is included in the JSON data."
           else
-            echo "The second-to-last day ($SECOND_LAST_DAY) is NOT included in the JSON data."
+            echo "Yesterday ($YESTERDAY) is NOT included in the JSON data."
             exit 1
           fi