26 lines
549 B
Bash
26 lines
549 B
Bash
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#!/bin/sh
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# $1 = 2013-11-08
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date_in=2013-11-08
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len=28
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len_s=$(( 28 * 24 * 60 * 60 ))
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# convert to ts
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date_s_in=$(date -jf %Y-%m-%d +%s $date_in)
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# add len
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date_s_out1=$(( date_s_in + len_s ))
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date_s_out2=$(( date_s_out1 + len_s ))
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date_s_out3=$(( date_s_out2 + len_s ))
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date_out1=$(date -jf %s +%Y-%m-%d $date_s_out1)
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date_out2=$(date -jf %s +%Y-%m-%d $date_s_out2)
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date_out3=$(date -jf %s +%Y-%m-%d $date_s_out3)
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echo "$date_in + $len days = $date_out1"
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echo "$date_out1 + $len days = $date_out2"
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echo "$date_out2 + $len days = $date_out3"
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