Template rest one day from the date
One way of solve the problem was chage to USE_TZ = False has Willem said in the comments, but that gives another error so I found the way to do it just adding in the template this {% load tz %} and using the flter |utc on the date variables like datedb|utc|date:'Y-m-d'.
In my view.py I obtain a date from my MSSQL database in this format 2018-12-06 00:00:00.000 so I pass that value as context like datedb and in my html page I render it like this {{datedb|date:"c"}} but it shows the date with one day less like this:

2018-12-05T18:00:00-06:00

Is the 06 not the 05 day.
why is this happening? how can I show the right date?