1.显示所有数据的列表命令
show dbs
![](/UpLoads/images/DATA/Mongo/20230107004701401330.jpg)
2.显示当前数据库对象或集合命令
db
![](/UpLoads/images/DATA/Mongo/20230107004701194039.jpg)
3.连接到一个指定的数据库命令
use local
![](/UpLoads/images/DATA/Mongo/20230107004701205580.jpg)
4.获取文档的创建时间命令
var newOjbect = ObjectId()
var newOjbect.getTimestamp()
![](/UpLoads/images/DATA/Mongo/20230107004701170102.jpg)
5.获取当前时间命令
var mydate = new Date()
mydate
//或
var mydate2 = ISODate()
mydate2
![](/UpLoads/images/DATA/Mongo/20230107004701741894.jpg)
//或
Date()
![](/UpLoads/images/DATA/Mongo/20230107004701801979.jpg)
6.判断数据类型命令
typeof mydate2
![](/UpLoads/images/DATA/Mongo/20230107004701884190.jpg)
7.转换为时间类型的字符串
var mydatestr = mydate.toString()
mydatestr
![](/UpLoads/images/DATA/Mongo/20230107004701669535.jpg)
![](/UpLoads/images/DATA/Mongo/20230107004701588753.jpg)