[Storage] --if-unmodified-since The condition specified using HTTP conditional header(s) is not met

[luisamador]

I have a storage account with a storage container called "backups".

when the storage container is empty (no blob backup files in it) this command works:

az storage blob delete-batch --source backups --if-unmodified-since `date -d "1 month ago" '+%Y-%m-%dT%H:%MZ'`
[]

the command above deletes the files that were not modified since the last month, and it works as expected.

if I upload one blob backup file into the storage container and run the same command, it errors:

az storage blob delete-batch --source backups --if-unmodified-since `date -d "1 month ago" '+%Y-%m-%dT%H:%MZ'`
The condition specified using HTTP conditional header(s) is not met.
<?xml version="1.0" encoding="utf-8"?><Error><Code>ConditionNotMet</Code><Message>**The condition specified using HTTP conditional header(s) is not met.**
RequestId:ce18a9b3-001e-0117-78ab-8bea95000000
Time:2018-01-12T13:45:08.3718745Z</Message></Error>

Another example:

I have uploaded two blob files into the same storage container (now the storage container is not empty, it contains the two blob backup files)

az storage blob delete-batch --source backups --if-unmodified-since `date -d "2 minutes ago" '+%Y-%m-%dT%H:%MZ'`
The condition specified using HTTP conditional header(s) is not met.
<?xml version="1.0" encoding="utf-8"?><Error><Code>ConditionNotMet</Code><Message>**The condition specified using HTTP conditional header(s) is not met.**

It errors but it has actually deleted one of the backup files that I uploaded 4 minutes ago.

It would be great to fix that error message since the delete operation is actually working properly. Thanks

[elibarzilay]

Sidenote for random readers: you should use a -u flag for date to make it show UTC times. (I'm guessing that you happened to use a machine that is on UTC time anyway.)

[arbaiti]

Hi luisamador,
Did you find a fix to this issue bacause i'm facing the same.
Regards,

[rupert-madden-abbott]

I've got this problem and can't tell from this ticket if this fix has been released yet.

What milestone did #5702 go into?

[williexu]

Milestone 33.
It was published yesterday on pypi, ver 2.0.29; sorry for the confusion.

[its-vincesanity]

Now it's 2021, and I got the same Problem as described above. So it's not fixed or is the example "just" not working?

[Rub21]

18-Feb-2022 , I got same error:

modified_since=$(date -d "-1 min" "+%Y-%m-%dT%H:%MZ")
az storage blob upload-batch \
				--destination $AZURE_CONTAINER_NAME/$REPLICATION_FOLDER \
				--source $workingDirectory \
				--if-modified-since $modified_since

[justinmchase]

This is happening on the delete also.