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Full Discussion: Valid separator in time and date format
Top Forums Shell Programming and Scripting Valid separator in time and date format Post 303035792 by jcdole on Monday 3rd of June 2019 09:33:52 AM
Old 06-03-2019
Valid separator in time and date format
Hello.
I can use any particular (stupid or not) format when using bash date command.
Example :
Code:
~> date --date "now" '+%Y-%m-%d %H!%M!%S'
2019-06-03 12!55!33

or
Code:
~> date --date "now" '+%Y£%m£%d %H¤%M¤%S'
2019£06£03 12¤57¤36

or
Code:
~> date --date "now" '+%Y-%m-%d %H-%M-%S'
2019-06-03 12-58-51

But I can't verify if the input date is in a particular format.
I use this piece of code to make verification :
Code:
d='2019-05-31 17:00:00'
MY_FORMAT='+%Y-%m-%d %H-%M-%S'


if [[ "`date --date "$d" "$MY_FORMAT" 2>/dev/null`" == "$d" ]] ; then
   echo "$d is valid to relative \"$MY_FORMAT\" date format"
else
  echo "$d is NOT VALID  to relative \"$MY_FORMAT\" date format"
fi

Example 1 : standard format and good date time ( Relative to date format template )
Code:
CURRENT FORMAT      : +%Y-%m-%d %H:%M:%S
DATE TO BE VERIFIED : 2019-05-31 17:00:00
Printing input date in current format : 
2019-05-31 17:00:00 
.
Now doing the test
.
2019-05-31 17:00:00 is valid to relative "+%Y-%m-%d %H:%M:%S" date format
.
.

Good result for the test



Example 2 : standard format and and bad date time ( Relative to date format template )
Code:
CURRENT FORMAT      : +%Y-%m-%d %H:%M:%S
DATE TO BE VERIFIED : 2019-05-31 17-00-00
Printing input date in current format : 
date: invalid date ‘2019-05-31 17-00-00'
 
.
Now doing the test
.

2019-05-31 17-00-00 is NOT VALID  to relative "+%Y-%m-%d %H:%M:%S" date format
.
.

Good result for the test.
But this is a coincidence.
In any data tested, the test will fail because the time format 'HH-MM-SS' is refused by the date command.
So the test will always failed.



Example 3 : personnal format and bad date time ( Relative to date format template )
Code:
CURRENT FORMAT      : +%Y-%m-%d %H-%M-%S
DATE TO BE VERIFIED : 2019-05-31 17:00:00
Printing input date in current format : 
2019-05-31 17-00-00 

.
Now doing the test
.

2019-05-31 17:00:00 is NOT VALID  to relative "+%Y-%m-%d %H-%M-%S" date format

.
.

Good result for the test

The date is accepted by the date command.
But the test fail because the time is not in the template format 'yyyy-mm-dd HH-MM-SS'.




Example 4 : personnal format and good date time ( Relative to date format template )
Code:
CURRENT FORMAT      : +%Y-%m-%d %H-%M-%S
DATE TO BE VERIFIED : 2019-05-31 17-00-00
Printing input date in current format : 
date: invalid date ‘2019-05-31 17-00-00'
 

.
Now doing the test
.

2019-05-31 17-00-00 is NOT VALID  to relative "+%Y-%m-%d %H-%M-%S" date format

.
.

Bad result for the test.
The test will always failed because the time format 'HH-MM-SS' is refused by the date command.
So the test failed.



Is it possible to test the relative to the format used if the format used is not standard.
Any help is welcome
This User Gave Thanks to jcdole For This Post:
rbatte1
 

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