Assuming Helm version 3+

You can use jq and xargs to accomplish this:

Question 1, to delete releases that were last updated before $TIMESTAMP (in seconds):

helm ls -o json | jq -r --argjson timestamp $TIMESTAMP '.[] | select (.updated | sub("\\..*";"Z") | sub("\\s";"T") | fromdate < now - $timestamp).name' | xargs -L1 helm uninstall

sub("\\..*";"Z") | sub("\\s";"T") converts the date format Helm uses in their output to ISO 8601.

Question 2, to delete releases with an app version older than $VERSION:

helm ls -o json | jq -r --argjson version $VERSION '.[] | select(.app_version | sub("\\.[0-9]
quot;;"") | tonumber | . < $version).name' | xargs -L1 helm uninstall

$VERSION should be major or major.minor only (i.e. 2 or 2.1). don't use a patch number.

Question 3, to delete releases by their initial deploy date, you'll have to parse the contents of the helm history RELEASE command for each release.

I won't solve this one, but it would look something like:

loop over helm ls
  get release name
  get first entry of helm history for that release
  pass to jq and process like the answer for question 1

Relevant Links:

• https://stedolan.github.io/jq/manual/#select(boolean_expression)
• https://stedolan.github.io/jq/manual/#sub(regex;tostring)sub(regex;string;flags)
• https://stedolan.github.io/jq/manual/#Dates
• https://helm.sh/docs/helm/helm_history/