refactor(helpers): construct custom clock based on env. use UTC as ti…

…mezone in production and Local in dev

app.core.go

@@ -74,9 +74,9 @@ func NewApp(start time.Time) (AppProvider, error) {
 	redisQueue := NewRedisQueue(redisClient)
 	boltDBConsumer := NewBoltDBConsumer(logger, redisQueue, boltBookStorage)
 
-	bookService := NewBookService(logger, config, NewClock(), redisBookStorage, boltBookStorage, redisQueue)
+	bookService := NewBookService(logger, config, NewClock(config.IsProduction), redisBookStorage, boltBookStorage, redisQueue)
 	stats := NewStatistics(config.GitTag, config.GitCommit, runtime.Version(), runtime.GOOS+"/"+runtime.GOARCH, IsAppRunningInDocker(), start)
-	apiService := NewAPIHandler(logger, config, stats, NewClock(), NewIDsHandler(), bookService)
+	apiService := NewAPIHandler(logger, config, stats, NewClock(config.IsProduction), NewIDsHandler(), bookService)
 
 	// Build the map of middlewares stacks.
 	middlewaresPublic, middlewaresOps := apiService.MiddlewaresStacks()

helpers.clock.go

@@ -12,14 +12,20 @@ type Clocker interface {
 }
 
 // Clock implements the Clocker interface.
-type Clock struct{}
+type Clock struct {
+	tz *time.Location
+}
 
-// NewClock returns a ready to use Clock.
-func NewClock() *Clock {
-	return &Clock{}
+// NewClock returns a ready to use Clock with timezone sets
+// to UTC in production environment and Local in dev env.
+func NewClock(isProd bool) *Clock {
+	if isProd {
+		return &Clock{time.UTC}
+	}
+	return &Clock{time.Local}
 }
 
 // Now provides current clock time.
 func (ck *Clock) Now() time.Time {
-	return time.Now()
+	return time.Now().In(ck.tz)
 }