我有一个日期,格式为 "27 JUN 2011",我想将其转换为 20110627
在 bash 中是否有可能实现?
#since this was yesterday
date -dyesterday +%Y%m%d
#more precise, and more recommended
date -d'27 JUN 2011' +%Y%m%d
#assuming this is similar to yesterdays `date` question from you
#https://dev59.com/hGw15IYBdhLWcg3wntEQ
date -d'last-monday' +%Y%m%d
#going on @seth's comment you could do this
DATE="27 jun 2011"; date -d"$DATE" +%Y%m%d
#or a method to read it from stdin
read -p " Get date >> " DATE; printf " AS YYYYMMDD format >> %s" `date
-d"$DATE" +%Y%m%d`
#which then outputs the following:
#Get date >> 27 june 2011
#AS YYYYMMDD format >> 20110627
#if you really want to use awk
echo "27 june 2011" | awk '{print "date -d\""$1FS$2FS$3"\" +%Y%m%d"}' | bash
#note | bash just redirects awk's output to the shell to be executed
#FS is field separator, in this case you can use $0 to print the line
#But this is useful if you have more than one date on a line
请注意,这仅适用于GNU date。
我已经阅读过:
Solaris版本的date不支持
-d
,可以通过替换sunfreeware.com版本的date来解决。
$ date -j -f "%m/%d/%y %H:%M:%S %p" "8/22/15 8:15:00 am" +"%m%d%y"
082215
您的例子:
$ date -j -f "%d %b %Y" "27 JUN 2011" +%Y%m%d
20110627
date
命令似乎表现得有些古怪。 - VaporwareWolfdate -d "25 JUN 2011" +%Y%m%d
输出
20110625
#
# Convert one date format to another
#
# Usage: convert_date_format <input_format> <date> <output_format>
#
# Example: convert_date_format '%b %d %T %Y %Z' 'Dec 10 17:30:05 2017 GMT' '%Y-%m-%d'
convert_date_format() {
local INPUT_FORMAT="$1"
local INPUT_DATE="$2"
local OUTPUT_FORMAT="$3"
local UNAME=$(uname)
if [[ "$UNAME" == "Darwin" ]]; then
# Mac OS X
date -j -f "$INPUT_FORMAT" "$INPUT_DATE" +"$OUTPUT_FORMAT"
elif [[ "$UNAME" == "Linux" ]]; then
# Linux
date -d "$INPUT_DATE" +"$OUTPUT_FORMAT"
else
# Unsupported system
echo "Unsupported system"
fi
}
# Example: 'Dec 10 17:30:05 2017 GMT' => '2017-12-10'
convert_date_format '%b %d %T %Y %Z' 'Dec 10 17:30:05 2017 GMT' '%Y-%m-%d'
仅使用bash:
convert_date () {
local months=( JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC )
local i
for (( i=0; i<11; i++ )); do
[[ $2 = ${months[$i]} ]] && break
done
printf "%4d%02d%02d\n" $3 $(( i+1 )) $1
}
并像这样调用它
d=$( convert_date 27 JUN 2011 )
d_old="27 JUN 2011"
d=$( convert_date $d_old ) # not quoted
只需要做:
data=`date`
datatime=`date -d "${data}" '+%Y%m%d'`
echo $datatime
20190206
data=`date`
datatime=`date -d "${data}" '+%Y%m%d %T'`
echo $data
Wed Feb 6 03:57:15 EST 2019
echo $datatime
20190206 03:57:15
或许自2011年以来有些变化,但对我来说这个方法有效:
$ date +"%Y%m%d"
20150330
不需要使用-d
参数即可获得相同的显示结果。
date -d
的答案通常适用于 GNUdate
(因此大多数 Linux 平台),而例如 BSD 和因此 MacOS 支持不同的选项和设施。为了完全可移植性,您需要限制自己使用 POSIXdate
,它实际上不支持日期格式之间的有意义的转换。 - tripleee