通常情况下，如果我们需要延长用户的密码过期日期时，我们只需重置该用户的密码。

但是我们可以在不重置密码的情况下增加用户的密码过期日期。

示例

[root@server ~]# chage -l linuxtribe
Last password change : Nov 22, 2010
Password expires : Feb 20, 2011
Password inactive : never
Account expires : never
Minimum number of days between password change : 0
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
[root@server ~]#

"Maximum number of days between password change" 有90天

执行下面的命令

[root@server ~]# chage -d 2011-02-20 linuxtribe

[root@server ~]# chage -l linuxtribe
Last password change : Feb 20, 2011
Password expires : May 20, 2011
Password inactive : never
Account expires : never
Minimum number of days between password change : 0
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
[root@server ~]#

可以看到 Password expires 变成了我们设置的日期 加上 90天。