[GitHub] [pulsar] candlerb opened a new issue #5540: reset-cursor to absolute time

[GitBox <gi...@apache.org>]

candlerb opened a new issue #5540: reset-cursor to absolute time
URL: https://github.com/apache/pulsar/issues/5540
 
 
   **Is your feature request related to a problem? Please describe.**
   It would be handy to be able to [reset-cursor](https://pulsar.apache.org/docs/en/next/pulsar-admin/#reset-cursor) to an absolute time, e.g. "start consuming from midnight".  Otherwise you have to calculate the time offset, and stuff it into the command immediately.
   
   There is a [mention](https://pulsar.apache.org/docs/en/next/admin-api-persistent-topics/#reset-cursor) of the corresponding REST API call which appears to have a `:timestamp` parameter - if that's an absolute time, then this is just an issue with the CLI.
   
   **Describe the solution you'd like**
   [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601#Durations) includes unambiguous ways of representing absolute and relative times.
   
   * `PT30M` - 30 minutes (relative offset)
   * `P1D` - one day (relative offset)
   * `1981-04-05T12:00` - absolute date/time (extended format)
   * `19810405T1200` - absolute date/time (basic format)
   
   It should be straightforward to parse and distinguish these cases, whilst falling back to existing behaviour (`10` = 10 minute offset, `2h` = 2 hour offset etc)
   

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