Chartjs-How can I represent data over timeslots in ChartJS?

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So, if anyone ever stumbles upon the same need and is using Django, here is the easiest method I finally devised : I created a custom tag to offset my x value (which is a datetime) by half of the timestep of my dataset.

In customtags.py:

def add_minutes(utc_datetime, minutes):
    time = datetime.datetime.strptime(utc_datetime, "%Y-%m-%dT%H:%M:%SZ") +  datetime.timedelta(minutes=minutes)
    return time.strftime("%Y-%m-%dT%H:%M:%SZ")

In my template (remember that my timestep is 20 minutes):

data: [{% for begin_time, data in myvalues.items %}{x: "{{begin_time | add_minutes:10}}", y: {{data | length}}},{% endfor %}],

Works like charm.

Cheers !

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