blocks|key|2013961|text|使用日期|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2013962|date+"%2B%25d/%25m/%25Y"+-d+"09/99/2013"+>+/dev/null++2>&1
+is_valid=$?|code-block|syntax|javascript|2013963|日期字符串必须是"MM/DD/YYYY“格式。|2013964|如果没有获得0，则日期格式无效。|2013965|entityMap|0|LINK|mutability|MUTABLE|url|http://www.gnu.org/software/coreutils/manual/html_node/date-invocation.html^0|2|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Use <a href="http://www.gnu.org/software/coreutils/manual/html_node/date-invocation.html" rel="noreferrer">date</a>
<pre><code>date &quot;+%d/%m/%Y&quot; -d &quot;09/99/2013&quot; &gt; /dev/null 2&gt;&amp;1
 is_valid=$?
</code></pre>
The date string must be in &quot;MM/DD/YYYY&quot; format.
If you do not get 0 then date is in invalid format.

blocks|key|938158|text|首先，使用regex检查输入的形式。然后使用awk切换到mm/dd/yyyy，并使用日期进行验证。可以在if语句中使用以下表达式：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|938159|echo+"$1"+%7C+egrep+-q+'%5E[0-3][0-9]/[0-1][0-9]/[0-9]{4}$'+&&+date+-d+"$(echo+"$1"+%7C+awk+'BEGIN{FS=OFS="/"}{print+$2"/"$1"/"$3}')"+>/dev/null+2>&1|code-block|syntax|javascript|938160|entityMap^0|1G|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

First, check the form of the input using the regex. Then use awk to switch to mm/dd/yyyy and use date to validate. You can use the following expression in your <code>if</code> statement:

<pre><code>echo "$1" | egrep -q '^[0-3][0-9]/[0-1][0-9]/[0-9]{4}$' &amp;&amp; date -d "$(echo "$1" | awk 'BEGIN{FS=OFS="/"}{print $2"/"$1"/"$3}')" &gt;/dev/null 2&gt;&amp;1
</code></pre>

blocks|key|938176|text|在Bash中实现dd/mm/yyyy的最简单方法是：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|938177|if+[[+$1+==+[0-3][0-9]/[0-1][0-9]/[0-9][0-9][0-9][0-9]+]]|code-block|syntax|javascript|938178|或|938179|if+[[+$1+=~+%5E[0-3][0-9]/[0-1][0-9]/[0-9]{4}$+]]|938180|entityMap^0|8|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Simplest way for <code>dd/mm/yyyy</code> exactly in Bash is:

<pre><code>if [[ $1 == [0-3][0-9]/[0-1][0-9]/[0-9][0-9][0-9][0-9] ]]
</code></pre>

Or

<pre><code>if [[ $1 =~ ^[0-3][0-9]/[0-1][0-9]/[0-9]{4}$ ]]
</code></pre>

blocks|key|938182|text|使用awk怎么样？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|938183|echo+"31/12/1999"+%7C+awk++-F+'/'+'{+print+($1+<=+31+&&+$2+<=+12+&&+match($3,+/%5E[1-9][1-9][1-9][1-9]$/))+?+"good"+:+"bad"+}'|code-block|syntax|javascript|938184|如果它的有效日期为“坏”，则打印“好”。|938185|entityMap^0|2|3|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

How about using <code>awk</code>:

<pre><code>echo "31/12/1999" | awk -F '/' '{ print ($1 &lt;= 31 &amp;&amp; $2 &lt;= 12 &amp;&amp; match($3, /^[1-9][1-9][1-9][1-9]$/)) ? "good" : "bad" }'
</code></pre>

It prints "good" if its valid date else prints "bad"

blocks|key|2014032|text|下面是一个函数来进行一些数据验证--如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2014033|#+Script+expecting+a+Date+parameter+in+MM-DD-YYYY+format+as+input
verifyInputDate(){
++++echo+${date}+%7C+grep+'%5E[0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]$'
++++if+[+$?+-eq+0+];+then
+++++++++echo+"Date+is+valid"
+++++else
++++++++++echo+"Date+is+not+valid"
+++++fi
}|code-block|syntax|javascript|2014034|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a function to do some data validation this:

<pre><code># Script expecting a Date parameter in MM-DD-YYYY format as input
verifyInputDate(){
 echo ${date} | grep '^[0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]$'
 if [ $? -eq 0 ]; then
 echo "Date is valid"
 else
 echo "Date is not valid"
 fi
}
</code></pre>

blocks|key|2014060|text|区块报价|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2014061|DATE+=+"$*"

[[+"${DATE}"+!=+@(((([123][0]%7C[012][1-9])%7C3[1])?([+\/._-])(0[13578]%7C1[02])?([+\/._-])(19%7C20)[0-9][0-9])%7C(([123][0]%7C[012][1-9])?([+\/._-])\
(0[469]%7C11)?([+\/._-])(19%7C20)[0-9][0-9])%7C(([12][0]%7C[01][1-9]%7C2[1-8])?([+\/._-])02?([+\/._-])(19%7C20)[0-9][0-9])%7C(29?([+\/._-])02?([+\/._-])\
(19%7C20(0[48]%7C[2468][048]%7C[13579][26]))))+]]+&&+echo+error+%7C%7C+echo+good)|code-block|syntax|javascript|2014062|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Blockquote

<pre><code>DATE = "$*"

[[ "${DATE}" != @(((([123][0]|[012][1-9])|3[1])?([ \/._-])(0[13578]|1[02])?([ \/._-])(19|20)[0-9][0-9])|(([123][0]|[012][1-9])?([ \/._-])\
(0[469]|11)?([ \/._-])(19|20)[0-9][0-9])|(([12][0]|[01][1-9]|2[1-8])?([ \/._-])02?([ \/._-])(19|20)[0-9][0-9])|(29?([ \/._-])02?([ \/._-])\
(19|20(0[48]|[2468][048]|[13579][26])))) ]] &amp;&amp; echo error || echo good)
</code></pre>

blocks|key|938228|text|#!+/bin/bash

isDateInvalid()
{
++++DATE="${1}"

++++#+Autorized+separator+char+['space',+'/',+'.',+'_',+'-']
++++SEPAR="([+\/._-])?"

++++#+Date+format+day[01..31],+month[01,03,05,07,08,10,12],+year[1900..2099]
++++DATE_1="((([123][0]%7C[012][1-9])%7C3[1])${SEPAR}(0[13578]%7C1[02])${SEPAR}(19%7C20)[0-9][0-9])"

++++#+Date+format+day[01..30],+month[04,06,09,11],+year[1900..2099]
++++DATE_2="(([123][0]%7C[012][1-9])${SEPAR}(0[469]%7C11)${SEPAR}(19%7C20)[0-9][0-9])"

++++#+Date+format+day[01..28],+month[02],+year[1900..2099]
++++DATE_3="(([12][0]%7C[01][1-9]%7C2[1-8])${SEPAR}02${SEPAR}(19%7C20)[0-9][0-9])"

++++#+Date+format+day[29],+month[02],+year[1904..2096]
++++DATE_4="(29${SEPAR}02${SEPAR}(19%7C20(0[48]%7C[2468][048]%7C[13579][26])))"

++++#+Match+the+date+in+the+Regex

++++if+!+[[+"${DATE}"+=~+"%5E(${DATE_1}%7C${DATE_2}%7C${DATE_3}%7C${DATE_4})$"+]]
++++then
++++++++echo+-e+"ERROR+-+'${DATE}'+invalid!"
++++else
++++++++echo+"${DATE}+is+valid"
++++fi
}

echo
echo+"Exp+1:+"`isDateInvalid+'12/13/3000'`
echo+"Exp+2:+"`isDateInvalid+'12/11/2014'`
echo+"Exp+3:+"`isDateInvalid+'12+01+2000'`
echo+"Exp+4:+"`isDateInvalid+'28-02-2014'`
echo+"Exp+5:+"`isDateInvalid+'12_02_2002'`+
echo+"Exp+6:+"`isDateInvalid+'12.10.2099'`
echo+"Exp+7:+"`isDateInvalid+'31/11/2000'`|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|938229|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>#! /bin/bash

isDateInvalid()
{
 DATE="${1}"

 # Autorized separator char ['space', '/', '.', '_', '-']
 SEPAR="([ \/._-])?"

 # Date format day[01..31], month[01,03,05,07,08,10,12], year[1900..2099]
 DATE_1="((([123][0]|[012][1-9])|3[1])${SEPAR}(0[13578]|1[02])${SEPAR}(19|20)[0-9][0-9])"

 # Date format day[01..30], month[04,06,09,11], year[1900..2099]
 DATE_2="(([123][0]|[012][1-9])${SEPAR}(0[469]|11)${SEPAR}(19|20)[0-9][0-9])"

 # Date format day[01..28], month[02], year[1900..2099]
 DATE_3="(([12][0]|[01][1-9]|2[1-8])${SEPAR}02${SEPAR}(19|20)[0-9][0-9])"

 # Date format day[29], month[02], year[1904..2096]
 DATE_4="(29${SEPAR}02${SEPAR}(19|20(0[48]|[2468][048]|[13579][26])))"

 # Match the date in the Regex

 if ! [[ "${DATE}" =~ "^(${DATE_1}|${DATE_2}|${DATE_3}|${DATE_4})$" ]]
 then
 echo -e "ERROR - '${DATE}' invalid!"
 else
 echo "${DATE} is valid"
 fi
}

echo
echo "Exp 1: "`isDateInvalid '12/13/3000'`
echo "Exp 2: "`isDateInvalid '12/11/2014'`
echo "Exp 3: "`isDateInvalid '12 01 2000'`
echo "Exp 4: "`isDateInvalid '28-02-2014'`
echo "Exp 5: "`isDateInvalid '12_02_2002'` 
echo "Exp 6: "`isDateInvalid '12.10.2099'`
echo "Exp 7: "`isDateInvalid '31/11/2000'`
</code></pre>

blocks|key|938237|text|`X="2016-04-21“然后检查以下值为1或0。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|938238|cal+echo+$x+%7C+cut+-c+6-7+echo+$x+%7C+cut+-c+1-4+2>/dev/null+\+grep+-c+echo+$x+%7C+cut+-c+9-10|offset|length|style|CODE|938239|如果值是1，那么它是有效的，否则它是无效的。|938240|entityMap^0|0|4|K|P|K|1W|L|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|K|$]]

`X="2016-04-21" then check for the below value being 1 or 0.

cal <code>echo $x | cut -c 6-7</code> <code>echo $x | cut -c 1-4</code> 2>/dev/null | grep -c <code>echo $x | cut -c 9-10</code>

If the value is 1, then it's valid, else it's not valid.

blocks|key|938305|text|最简单的解决方案，仍然工作完美，是以下几点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|938306|if+[[+$1+=~+%5E[0-9]{4}-[0-9]{2}-[0-9]{2}$+]]+&&+date+-d+"$1"+>/dev/null+2>&1
+++...|code-block|syntax|javascript|938307|它包括合并两个检查：|938308|第一部分检查$1是否为这种格式：NNNN-NN-NN|unordered-list-item|offset|length|style|CODE|938309|第二部分检查它是否为有效日期。|938310|你需要这两张支票，因为：|938311|如果不执行第一次检查，date将退出代码0，即使变量是(另一格式的)中的有效日期。|BOLD|938312|如果不执行第二次检查，那么即使对于2016-13-45这样的变量，也可以得到0。|938313|entityMap^0|0|0|0|6|2|G|A|0|0|0|B|4|R|6|0|H|A|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|13|8|@$L|14|M|15|N|O]|$L|16|M|17|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|K|7|18|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|19|8|@]|9|@]|A|$]]|$1|T|3|U|5|K|7|1A|8|@$L|1B|M|1C|N|O]|$L|1D|M|1E|N|V]]|9|@]|A|$]]|$1|W|3|X|5|K|7|1F|8|@$L|1G|M|1H|N|O]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|Z|$]]

The simplest solution, that still works perfectly, is the following :

<pre><code>if [[ $1 =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]] &amp;&amp; date -d "$1" &gt;/dev/null 2&gt;&amp;1
 ...
</code></pre>

It consists in combining 2 checks :

<ul>
<li>the first part checks that <code>$1</code> is of this format : <code>NNNN-NN-NN</code></li>
<li>the second part checks that it is a valid date</li>
</ul>

You need the two checks because :

<ul>
<li>if you don't do the first check, <code>date</code> will exit with code 0 even if your variable is a valid date in another format</li>
<li>if you don't do the second check, then you can end up with a 0 even for variables such as <code>2016-13-45</code></li>
</ul>

blocks|key|44672|text|我编写了这个bash脚本来验证日期。我可以接受蒙作为字母数字。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|44673|#!/bin/bash

function+isDateValid+{
++++DATE=$1

++++if+[[+$DATE+=~+%5E[0-9]{1,2}-[0-9a-zA-Z]{1,3}-[0-9]{4}$+]];+then
++++++++echo+"Date+$DATE+is+a+number!"
++++++++day=`echo+$DATE+%7C+cut+-d'-'+-f1`
++++++++month=`echo+$DATE+%7C+cut+-d'-'+-f2`
++++++++year=`echo+$DATE+%7C+cut+-d'-'+-f3`

++++++++++++++++if+[+"$month"+==+"01"+]+%7C%7C+[+"$month"+==+"1"+];+then
++++++++++++++++++++++++month="Jan"
++++++++++++++++elif+[+"$month"+==+"02"+]+%7C%7C+[+"$month"+==+"2"+];+then
++++++++++++++++++++++++month="Feb"
++++++++++++++++elif+[+"$month"+==+"03"+]+%7C%7C+[+"$month"+==+"3"+];+then
++++++++++++++++++++++++month="Mar"
++++++++++++++++elif+[+"$month"+==+"04"+]+%7C%7C+[+"$month"+==+"4"+];+then
++++++++++++++++++++++++month="Apr"
++++++++++++++++elif+[+"$month"+==+"05"+]+%7C%7C+[+"$month"+==+"5"+];+then
++++++++++++++++++++++++month="May"
++++++++++++++++elif+[+"$month"+==+"06"+]+%7C%7C+[+"$month"+==+"6"+];+then
++++++++++++++++++++++++month="Jun"
++++++++++++++++elif+[+"$month"+==+"07"+]+%7C%7C+[+"$month"+==+"7"+];+then
++++++++++++++++++++++++month="Jul"
++++++++++++++++elif+[+"$month"+==+"08"+]+%7C%7C+[+"$month"+==+"8"+];+then
++++++++++++++++++++++++month="Aug"
++++++++++++++++elif+[+"$month"+==+"09"+]+%7C%7C+[+"$month"+==+"9"+];+then
++++++++++++++++++++++++month="Sep"
++++++++++++++++elif+[+"$month"+==+"10"+];+then
++++++++++++++++++++++++month="Oct"
++++++++++++++++elif+[+"$month"+==+"11"+];+then
++++++++++++++++++++++++month="Nov"
++++++++++++++++elif+[+"$month"+==+"12"+];+then
++++++++++++++++++++++++month="Dec"
++++++++++++++++fi

++++++++ymd=$year"-"$month"-"$day
++++++++echo+"ymd:+"$ymd
++++++++dmy=$(echo+"$ymd"+%7C+awk+-F-+'{+OFS=FS;+print+$3,$2,$1+}')
++++++++echo+"dmy:+"$dmy
++++++++if+date+--date+"$dmy"+>/dev/null+2>&1;+then
++++++++++++++++echo+"OK"
++++++++++++return+0
++++++++else
++++++++++++++++echo+"NOK"
++++++++++++return+1
++++++++fi
++++else
++++++++echo+"Date+$DATE+is+not+a+number"
++++++++return+1
++++fi
}


if+isDateValid+"15-15-2014";+then
++++echo+"date+is+valid+=)"
else
++++echo+"bad+format+date"
fi
echo+"==================="
if+isDateValid+"15-12-2014";+then
++++++++echo+"date+is+valid+=)"
else
++++++++echo+"bad+format+date"
fi
echo+"==================="
if+isDateValid+"15-Dec-2014";+then
++++++++echo+"date+is+valid+=)"
else
++++++++echo+"bad+format+date"
fi
echo+"==================="
if+isDateValid+"1-May-2014";+then
++++++++echo+"date+is+valid+=)"
else
++++++++echo+"bad+format+date"
fi
echo+"==================="
if+isDateValid+"1-1-2014";+then
++++++++echo+"date+is+valid+=)"
else
++++++++echo+"bad+format+date"
fi
echo+"==================="
if+isDateValid+"12-12-2014";+then
++++++++echo+"date+is+valid+=)"
else
++++++++echo+"bad+format+date"
fi|code-block|syntax|javascript|44674|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I wrote this bash script to validate date. I can accept mont as alphanumeric.

<pre><code>#!/bin/bash

function isDateValid {
 DATE=$1

 if [[ $DATE =~ ^[0-9]{1,2}-[0-9a-zA-Z]{1,3}-[0-9]{4}$ ]]; then
 echo "Date $DATE is a number!"
 day=`echo $DATE | cut -d'-' -f1`
 month=`echo $DATE | cut -d'-' -f2`
 year=`echo $DATE | cut -d'-' -f3`

 if [ "$month" == "01" ] || [ "$month" == "1" ]; then
 month="Jan"
 elif [ "$month" == "02" ] || [ "$month" == "2" ]; then
 month="Feb"
 elif [ "$month" == "03" ] || [ "$month" == "3" ]; then
 month="Mar"
 elif [ "$month" == "04" ] || [ "$month" == "4" ]; then
 month="Apr"
 elif [ "$month" == "05" ] || [ "$month" == "5" ]; then
 month="May"
 elif [ "$month" == "06" ] || [ "$month" == "6" ]; then
 month="Jun"
 elif [ "$month" == "07" ] || [ "$month" == "7" ]; then
 month="Jul"
 elif [ "$month" == "08" ] || [ "$month" == "8" ]; then
 month="Aug"
 elif [ "$month" == "09" ] || [ "$month" == "9" ]; then
 month="Sep"
 elif [ "$month" == "10" ]; then
 month="Oct"
 elif [ "$month" == "11" ]; then
 month="Nov"
 elif [ "$month" == "12" ]; then
 month="Dec"
 fi

 ymd=$year"-"$month"-"$day
 echo "ymd: "$ymd
 dmy=$(echo "$ymd" | awk -F- '{ OFS=FS; print $3,$2,$1 }')
 echo "dmy: "$dmy
 if date --date "$dmy" &gt;/dev/null 2&gt;&amp;1; then
 echo "OK"
 return 0
 else
 echo "NOK"
 return 1
 fi
 else
 echo "Date $DATE is not a number"
 return 1
 fi
}


if isDateValid "15-15-2014"; then
 echo "date is valid =)"
else
 echo "bad format date"
fi
echo "==================="
if isDateValid "15-12-2014"; then
 echo "date is valid =)"
else
 echo "bad format date"
fi
echo "==================="
if isDateValid "15-Dec-2014"; then
 echo "date is valid =)"
else
 echo "bad format date"
fi
echo "==================="
if isDateValid "1-May-2014"; then
 echo "date is valid =)"
else
 echo "bad format date"
fi
echo "==================="
if isDateValid "1-1-2014"; then
 echo "date is valid =)"
else
 echo "bad format date"
fi
echo "==================="
if isDateValid "12-12-2014"; then
 echo "date is valid =)"
else
 echo "bad format date"
fi
</code></pre>

blocks|key|2014181|text|此函数需要两个字符串，一个格式字符串，一个日期字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2014182|格式字符串使用日期命令中的代码，但不包括“%2B”|2014183|如果提供的日期与给定格式匹配，则函数返回0，否则返回1。|2014184|码(my_script.sh)|offset|length|style|BOLD|2014185|#!/bin/bash

datecheck()+{
++++local+format="$1"+d="$2"
++++[[+"$(date+"%2B$format"+-d+"$d"+2>/dev/null)"+==+"$d"+]]
}

date_test="$1"

echo+$date_test
if+datecheck+"%25d+%25b+%25Y"+"$date_test";+then
++++echo+OK
else
++++echo+KO
fi|code-block|syntax|javascript|2014186|输出|2014187|$+./my_script.sh+"05+Apr+2020"
05+Apr+2020
OK
$+./my_script.sh+"foo+bar"
foo+bar
KO|2014188|entityMap^0|0|0|0|0|F|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@$H|10|I|11|J|K]]|9|@]|A|$]]|$1|L|3|M|5|N|7|12|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|13|8|@$H|14|I|15|J|K]]|9|@]|A|$]]|$1|S|3|T|5|N|7|16|8|@]|9|@]|A|$O|P]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

This function expects 2 strings,a format string, a date string

The format string uses the codes from the date command but does not include the '+'

The function returns 0 if the provided date matches the given format, otherwise it returns 1

Code (my_script.sh)

<pre class="lang-bash prettyprint-override"><code>#!/bin/bash

datecheck() {
 local format="$1" d="$2"
 [[ "$(date "+$format" -d "$d" 2&gt;/dev/null)" == "$d" ]]
}

date_test="$1"

echo $date_test
if datecheck "%d %b %Y" "$date_test"; then
 echo OK
else
 echo KO
fi
</code></pre>

Output

<pre class="lang-none prettyprint-override"><code>$ ./my_script.sh "05 Apr 2020"
05 Apr 2020
OK
$ ./my_script.sh "foo bar"
foo bar
KO
</code></pre>

blocks|key|2014233|text|尽管@+-d的解决方案(如果[+$1+=~+%5E0-9{4}-0-9{2}-0-9{2}$+]&+date+2>&1+"$1“>/dev/null+2>&1)是最好的解决方案，但它会产生错误，因为在if语句中不能直接比较/匹配regex。我们应该将正则表达式放在变量中，然后在if语句中比较/匹配该变量。此外，if条件的第二部分不返回布尔值，因此这个部分也会导致错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2014234|所以我在上面的公式中做了一些修改，这个修改也可以根据不同的其他格式或它们的组合来定制。|2014235|DATEVALUE=2019-11-12
REGEX='%5E[0-9]{4}-[0-9]{2}-[0-9]{2}$'
if+[[+$DATEVALUE+=~+$REGEX+]]+;+then
++++date+-d+$DATEVALUE+
++if+[+$?+-eq+0+]+;+then
++++echo+"RIGHT+DATE"
+++else+
++++echo+"WRONG+DATE"
++fi
else
+echo+"WRONG+FORMAT"
fi|code-block|syntax|javascript|2014236|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Though the solution (if [[ $1 =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]] &amp;&amp; date -d "$1" >/dev/null 2>&amp;1) of @<a href="https://stackoverflow.com/users/2873507/vic-seedoubleyew">https://stackoverflow.com/users/2873507/vic-seedoubleyew</a> is best one at least for linux, but it gives error as we can not directly compare/match regex in if statement. We should put the regex in a variable and then we should compare/match that variable in if statement. Moreover second part of if condition does not return a boolean value so this part will also cause error.

So I have done slight modification in the above formula and this modification can also be customized further for various other formats or combination of them.

<pre><code>DATEVALUE=2019-11-12
REGEX='^[0-9]{4}-[0-9]{2}-[0-9]{2}$'
if [[ $DATEVALUE =~ $REGEX ]] ; then
 date -d $DATEVALUE 
 if [ $? -eq 0 ] ; then
 echo "RIGHT DATE"
 else 
 echo "WRONG DATE"
 fi
else
 echo "WRONG FORMAT"
fi
</code></pre>

blocks|key|2014274|text|我想对稍微不同的格式给出一个扩展的答案，但这可以很容易地更改为dd/mm/YY格式，并且已经给出了答案；它是在busybox+(posix+shell)上测试的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2014275|这是类似于"busybox+shell脚本日期“和”测试格式“或”验证“等web搜索的第一次点击，所以这里我的busybox解决方案(用1.29.3，1.23.1进行了测试)。|2014276|#!/bin/sh

##########
#
#+check+if+date+valid+in+busybox
#+++tested+in+busybox+1.29.3,+1.23.1
#
#+call+with:
#+++$0+<yyyymmdd>
#
##########

mydate=$1

if+echo+$mydate+%7C+grep+-qE+'20[0-9][0-9](0[1-9]%7C1[0-2])([012][0-9]%7C3[01])';+then
++++printf+'may+be+valid\n'

++++date+%2B%25Y%25m%25d+-d+$mydate+-D+%25Y%25m%25d+>+/dev/null++2>&1
++++is_valid=$?
++++if+[+$is_valid+!=+0+];+then
++++++++printf+'not+valid\n'
++++++++return+1
++++else
++++++++mytestdate=$(date+%2B%25Y%25m%25d+-d+$mydate+-D+%25Y%25m%25d)
++++++++if+[+$mydate+!=+$mytestdate+];+then
++++++++++++printf+'not+valid,+results+in+"%25s"\n'+"$mytestdate"
++++++++++++return+1
++++++++else
++++++++++++printf+'valid\n'
++++++++fi
++++fi
else
++++printf+'not+valid+(must+be:+<yyyymmdd>)\n'
++++return+1
fi|code-block|syntax|javascript|2014277|正如在busybox+(1.29.3和1.23.1)中一样，您的响应如下：|2014278|lxsys:~#+date+%2B%25Y%25m%25d+-d+20110229+-D+"%25Y%25m%25d"
20110301|2014279|我需要以更好的方式验证日期，但我想主要依靠系统本身。|2014280|所以说|2014281|mytestdate=$(date+%2B%25Y%25m%25d+-d+$mydate+-D+%25Y%25m%25d)
if+[+$mydate+!=+$mytestdate+];+then
++++...
fi|2014282|还有第二个测试-我们有一个不同的希望或给定的格式(输入，$mydate)和系统解释(输出，$mytestdate)的.如果不一样，就放弃日期|offset|length|style|CODE|2014283|entityMap^0|0|0|0|0|0|0|0|0|S|7|19|B|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|18|8|@$U|19|V|1A|W|X]|$U|1B|V|1C|W|X]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Z|$]]

I would like to give an extended answer for a slightly different format, but this can easily be changed to the dd/mm/YY format with the answers already given; it's tested on busybox (posix shell)
This is one of the first hits for web searches similar to &quot;busybox posix shell script date&quot; and &quot;test format&quot; or &quot;validate&quot; etc, so here my solution for busybox (tested with 1.29.3, 1.23.1)
<pre><code>#!/bin/sh

##########
#
# check if date valid in busybox
# tested in busybox 1.29.3, 1.23.1
#
# call with:
# $0 &lt;yyyymmdd&gt;
#
##########

mydate=$1

if echo $mydate | grep -qE '20[0-9][0-9](0[1-9]|1[0-2])([012][0-9]|3[01])'; then
 printf 'may be valid\n'

 date +%Y%m%d -d $mydate -D %Y%m%d &gt; /dev/null 2&gt;&amp;1
 is_valid=$?
 if [ $is_valid != 0 ]; then
 printf 'not valid\n'
 return 1
 else
 mytestdate=$(date +%Y%m%d -d $mydate -D %Y%m%d)
 if [ $mydate != $mytestdate ]; then
 printf 'not valid, results in &quot;%s&quot;\n' &quot;$mytestdate&quot;
 return 1
 else
 printf 'valid\n'
 fi
 fi
else
 printf 'not valid (must be: &lt;yyyymmdd&gt;)\n'
 return 1
fi
</code></pre>
as in busybox (1.29.3 &amp; 1.23.1) you have responds like:
<pre><code>lxsys:~# date +%Y%m%d -d 20110229 -D &quot;%Y%m%d&quot;
20110301
</code></pre>
I had the need to validate the date in some better way but i wanted to rely mostly on the system itself
so with
<pre><code>mytestdate=$(date +%Y%m%d -d $mydate -D %Y%m%d)
if [ $mydate != $mytestdate ]; then
 ...
fi
</code></pre>
there is a second test - do we have a difference between the wanted or given format (input, <code>$mydate</code>) and the system interpretation (output, <code>$mytestdate</code>) of it ... if it's not the same, discard the date

I have to create a Shell Script wherein one of the parameters will be the date in the format dd/mm/yyyy. My question is, how can I check if the Date passed as parameter really follows this Date Format? I tried to use the grep command as below:

<pre><code>if echo "$1" | grep -q '^[0-3][0-9]/[0-1][0-9]/[0-9]\{4\}$'
</code></pre>

but it didn't give the correct format because the day for example can be 33, 34, (...), that is not really the correct format. Anyone know something that can really check if the date passed really follows the format dd/mm/yyyy ?

Validate date format in a shell script

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我必须创建一个Shell脚本，其中一个参数将是dd/mm/yyyy格式的日期。我的问题是，如何检查作为参数传递的日期是否真的遵循此日期格式？我尝试使用grep命令，如下所示：if echo "$1" | grep -q '^[0-3][0-9]/[0-1][0-9]/[0-9]\{4\}$'但是它没有给出正确的格式，因...

问验证shell脚本中的日期格式
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