Fix post `created` date in SQLite

We store times in UTC in all other places, but the post.Created logic
when creating a post meant that dates were being stored in a user's
local timezone. This fixes that.

Ref T529

database.go

@@ -574,11 +574,19 @@ func (db *datastore) CreatePost(userID, collID int64, post *SubmittedPost) (*Pos
 	}
 
 	created := time.Now()
+	if db.driverName == driverSQLite {
+		// SQLite stores datetimes in UTC, so convert time.Now() to it here
+		created = created.UTC()
+	}
 	if post.Created != nil {
 		created, err = time.Parse("2006-01-02T15:04:05Z", *post.Created)
 		if err != nil {
 			log.Error("Unable to parse Created time '%s': %v", *post.Created, err)
 			created = time.Now()
+			if db.driverName == driverSQLite {
+				// SQLite stores datetimes in UTC, so convert time.Now() to it here
+				created = created.UTC()
+			}
 		}
 	}