job_pause causes AttributeError 'NoneType' object has no attribute 'strftime'

[constantinoantunes]

Using django-apscheduler==0.2.13:

• Add a job
• Pause the job
• Open /admin/django_apscheduler/djangojob/

The following error is presented:

AttributeError at /admin/django_apscheduler/djangojob/
'NoneType' object has no attribute 'strftime'

It happens in: lib\site-packages\django_apscheduler\admin.py in next_run_time_sec, line 35

This method:

    def next_run_time_sec(self, obj):
        return obj.next_run_time.strftime("%Y-%m-%d %H:%M:%S")

[jcass77]

The next_run_time_sec implementation is also problematic for a different reason: if timezone support is activated via USE_TZ, then the string output by next_run_time_sec will show UTC time, while the rest of django-admin shows the local time.

The way that django-apscheduler shows timezone-aware datetimes can be quite confusing as a result.

[D4VID0x2]

Can confirm that in django-apscheduler==0.3.0 the issue is still there.
Here is a workaround: #68
add this check before the return statement

if obj.next_run_time is None:
    return "(paused)"

[jcass77]

Fixed via #68.