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markstokan and derwei Swap out cronexpr library to add support for DST

Signed-off-by: Derwei Chan <>
Latest commit 0e833e2 Jun 13, 2018
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Godeps Swap out cronexpr library to add support for DST Jun 13, 2018
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check Swap out cronexpr library to add support for DST Jun 13, 2018
in Fixes import paths Nov 20, 2015
models fix typo: immedietely => immediately Jan 24, 2017
Dockerfile Re-adds Dockerfile for opensourcing repo. Sep 18, 2015
LICENSE Adds LICENSE and NOTICE files Nov 10, 2015
NOTICE Adds LICENSE and NOTICE files Nov 10, 2015 Updates readme to point to cron-resource instead of cron-test. Jul 17, 2017 Updates go binaries to use go 1.7, adds script to build binaries Aug 19, 2016
built-check Swap out cronexpr library to add support for DST Jun 13, 2018
built-in Swap out cronexpr library to add support for DST Jun 13, 2018

Crontab Resource

Implements a resource that reports new versions when the current time matches the crontab expression

Update your pipeline

Update your pipeline to include this new declaration of resource types. See the example pipeline yml snippet below or the Concourse docs for more details here.

- name: cron-resource
  type: docker-image
    repository: cftoolsmiths/cron-resource

  - name: 10-min-trigger
    type: cron-resource
      expression: "*/10 * * * *"
      location: "America/New_York"
      fire_immediately: true

Source Configuration

  • expression: Required. The crontab expression:

    field allowed values
    minute 0-59
    hour 0-23
    day of month 1-31
    month 1-12 (or names, see below)
    day of week 0-7 (0 or 7 is Sun, or use names)


    0 23 * * 1-5 # Run at 11:00pm from Monday to Friday

  • location: Optional. Defaults to UTC. Accepts any timezone that can be parsed by




  • fire_immediately: Optional. Defaults to false. Immediately triggers the resource the first time it is checked.


check: Report the current time.

Returns time.Now() as the version only if a minute since we last fired matches the crontab expression. The first time the script runs it will fire if a minute in the last hour matches the crontab expression.



in: Report the given time

If triggered by check, returns the original version as the resulting version.


  1. Output directory. The directory where the in script will store the requested version

out: Not implemented.

Developer Notes

Building the jobs

To build the resource's go binaries, run the following command from within the cron-resource directory:

docker run -v "$PWD":/go/src/ \
           -it golang:1.7 \
           /bin/bash /go/src/

You should see two new binaries named built-in and built-check.

Testing the go binaries

Start an interactive session of your docker container to run the binaries:

docker run -v "$PWD":/go/src/ \
           -it golang:1.7 \

Within the interactive session:

cd /go/src/

It looks like it hangs, but it's waiting for you to enter some JSON:

{"source":{"expression":"* * * * *","location":"America/New_York"} } # Paste this in after running ./built-check
[{"time":"2016-08-19T10:15:27.183011117-04:00"}] # This is the successful output
>>>>>>> Updates README with instructions on how to use Concourse's resource types, Adds developer notes.
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