https://stackoverflow.com/questions/6386172/datetimefield-doesnt-show-in-admin-system
class RatingAdmin(admin.ModelAdmin):
readonly_fields = (‘date‘,)
admin.site.register(Rating,RatingAdmin)
Django - 后台admin不显示带auto_now, auto_now_add选项的字段
原文：https://www.cnblogs.com/allen2333/p/10124376.html