improve nil receiver handling for package gtime (#2226)

* improve nil receiver handling for package gtime

* CI updates

* CI updates

.github/workflows/gf.yml

@@ -141,6 +141,12 @@ jobs:
     - name: Checkout Repository
       uses: actions/checkout@v2
 
+    - name: Start Apollo Containers
+      run:  docker-compose -f ".github/workflows/apollo/docker-compose.yml" up -d --build
+
+    - name: Start Redis Cluster Containers
+      run:  docker-compose -f ".github/workflows/redis/docker-compose.yml" up -d --build
+
     - name: Start Minikube
       uses: medyagh/setup-minikube@master
 
@@ -161,22 +167,16 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-go-${{ matrix.go-version }}-
 
-    - name: Start redis cluster containers
-      run:  docker-compose -f ".github/workflows/redis/docker-compose.yml" up -d --build
-
-    - name: Start apollo containers
-      run:  docker-compose -f ".github/workflows/apollo/docker-compose.yml" up -d --build
-
     - name: Before Script
       run:  bash .github/workflows/before_script.sh
 
     - name: Build & Test
       run:  bash .github/workflows/build_and_test.sh
 
-    - name: Stop redis cluster containers
+    - name: Stop Redis Cluster Containers
       run:  docker-compose -f ".github/workflows/redis/docker-compose.yml" down
 
-    - name: Stop apollo containers
+    - name: Stop Apollo Containers
       run:  docker-compose -f ".github/workflows/apollo/docker-compose.yml" down
 
     - name: Report Coverage

os/gtime/gtime_time.go

@@ -317,7 +317,16 @@ func (t *Time) Truncate(d time.Duration) *Time {
 // See the documentation on the Time type for the pitfalls of using == with
 // Time values; most code should use Equal instead.
 func (t *Time) Equal(u *Time) bool {
-	return t.Time.Equal(u.Time)
+	switch {
+	case t == nil && u != nil:
+		return false
+	case t == nil && u == nil:
+		return true
+	case t != nil && u == nil:
+		return false
+	default:
+		return t.Time.Equal(u.Time)
+	}
 }
 
 // Before reports whether the time instant t is before u.
@@ -327,7 +336,14 @@ func (t *Time) Before(u *Time) bool {
 
 // After reports whether the time instant t is after u.
 func (t *Time) After(u *Time) bool {
-	return t.Time.After(u.Time)
+	switch {
+	case t == nil:
+		return false
+	case t != nil && u == nil:
+		return true
+	default:
+		return t.Time.After(u.Time)
+	}
 }
 
 // Sub returns the duration t-u. If the result exceeds the maximum (or minimum)
@@ -335,6 +351,9 @@ func (t *Time) After(u *Time) bool {
 // will be returned.
 // To compute t-d for a duration d, use t.Add(-d).
 func (t *Time) Sub(u *Time) time.Duration {
+	if t == nil || u == nil {
+		return 0
+	}
 	return t.Time.Sub(u.Time)
 }