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at 5pm + 3 days /bin/ls
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at 5pm + 2 weeks /bin/ls
Ã÷ÌìµÄ 17:20 Ö´ÐÐ /bin/date :
at 17:20 tomorrow /bin/date
1999 ÄêµÄ×îºóÒ»ÌìµÄ×îºóÒ»·ÖÖÓÓ¡³ö the end of world !
at 23:59 12/31/1999 echo the end of world !


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