shell 日期加减运算

$ 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 "+

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