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Datetime adjuster for Django Templates

Author:
McAnix
Posted:
July 22, 2015
Language:
Python
Version:
1.4
Tags:
template filter datetime calculation adjust relativedelta
Score:
1 (after 1 ratings)

The filter is specific to datetime objects and no allowance has been made to convert strings or epoch times. Also no type checking is performed so misuse will result in an error.

To use include the above snippet in a file called templatetags/customfilters.py or append to existing filters file then load:

{% load customfilters %}

in your template, then to use it:

{{ dateobject|adjust:"months=1"|date:"Y/m/d" }}

To push the dateobject forward by a month, or:

{{ dateobject|adjust:"weeks=-1"|date:"Y/m/d" }}

To push the dateobject back a week, or:

{{ dateobject|adjust:"years=1, months=2"|date:"Y/m/d" }}

To push the dateobject forward by a year and 2 months

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from dateutil.relativedelta import relativedelta
from django import template

register = template.Library()

@register.filter
def adjust(value, arg):
  """Adjusts the datetime object by the argument and returns the new datetime for formatting
  
    @note: Uses relativedelta to adjust the date object
  
    Usage: {{ dateobject|adjust:"weeks=1" }}, or
           {{ dateobject|adjust:"weeks=1, days=2"|date:"Y m d" }}
  """
  args = dict(tuple(e.split('=')) for e in arg.split(', '))
  
  for k, v in args.iteritems():
    args[k] = int(v) # Convert all values to integers
  
  return value + relativedelta(**args)

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