shell 日期加减运算

比如今日是2012-04-22

$ date -d "+1 day" +%Y-%m-%d

2012-04-23

 

$ date -d "-1 day" +%Y-%m-%d

2012-04-21

 

$ date -d "2012-04-10 -1 day " +%Y-%m-%d

2012-04-09

 

$ date -d "2012-04-10 +1 day " +%Y-%m-%d

2012-04-11

 

$ date -d "-1 week " +%Y-%m-%d

2012-04-15

 

$ date -d "+1 week " +%Y-%m-%d

2012-04-29

 

$ date -d "+1 month " +%Y-%m-%d

2012-05-22

 

$ date -d "-1 month " +%Y-%m-%d

2012-03-22

 

$ date -d "-1 year " +%Y-%m-%d

2011-04-22

 

$ date -d "+1 year " +%Y-%m-%d

2013-04-22

原文地址：http://www.cnblogs.com/howhy/p/5999762.html