del.sls

{% if grains['fqdn'] == 'server1' %}

{% set username = pillar['client'] %}
{% set form_time_date = pillar['form_time_date'] %}

{% if salt['file.contains_regex']('/srv/ftp/users/{{ username }}/README', {{ form_time_date }} %}

delete_entire_dir:
  file.absent:
    - name: /srv/ftp/users/{{ username }}

{{ endif }}
{{ endif }}

ErrorOutput.txt

- Rendering SLS prod.ftp24 failed, render error: while parsing a block mapping
        in "<unicode string>", line 38, column 9:
                - pillar='{"client": "myclient", ...
                  ^
      expected <block end>, but found ','
        in "<unicode string>", line 38, column 40:
           ...  pillar='{"client": "myclient","form_time_date": "25/02/2017 0 ...
                                               ^
      Traceback (most recent call last):
        File "/usr/lib/python2.7/site-packages/salt/state.py", line 2532, in render_state
          sls, rendered_sls=mods
        File "/usr/lib/python2.7/site-packages/salt/template.py", line 79, in compile_template
          ret = render(input_data, saltenv, sls, **render_kwargs)
        File "/usr/lib/python2.7/site-packages/salt/renderers/yaml.py", line 50, in render
          data = load(yaml_data, Loader=get_yaml_loader(argline))
        File "/usr/lib64/python2.7/site-packages/yaml/__init__.py", line 71, in load
          return loader.get_single_data()
        File "/usr/lib64/python2.7/site-packages/yaml/constructor.py", line 37, in get_single_data
          node = self.get_single_node()
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 36, in get_single_node
          document = self.compose_document()
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 55, in compose_document
          node = self.compose_node(None, None)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 84, in compose_node
          node = self.compose_mapping_node(anchor)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 133, in compose_mapping_node
          item_value = self.compose_node(node, item_key)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 84, in compose_node
          node = self.compose_mapping_node(anchor)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 133, in compose_mapping_node
          item_value = self.compose_node(node, item_key)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 82, in compose_node
          node = self.compose_sequence_node(anchor)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 111, in compose_sequence_node
          node.value.append(self.compose_node(node, index))
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 84, in compose_node
          node = self.compose_mapping_node(anchor)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 133, in compose_mapping_node
          item_value = self.compose_node(node, item_key)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 82, in compose_node
          node = self.compose_sequence_node(anchor)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 111, in compose_sequence_node
          node.value.append(self.compose_node(node, index))
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 84, in compose_node
          node = self.compose_mapping_node(anchor)
        File "/usr/lib64/python2.7/site-packages/yaml/composer.py", line 127, in compose_mapping_node
          while not self.check_event(MappingEndEvent):
        File "/usr/lib64/python2.7/site-packages/yaml/parser.py", line 98, in check_event
          self.current_event = self.state()
        File "/usr/lib64/python2.7/site-packages/yaml/parser.py", line 439, in parse_block_mapping_key
          "expected <block end>, but found %r" % token.id, token.start_mark)
      ParserError: while parsing a block mapping
        in "<unicode string>", line 38, column 9:
                - pillar='{"client": "myclient", ...
                  ^
      expected <block end>, but found ','
        in "<unicode string>", line 38, column 40:
           ...  pillar='{"client": "myclient","form_time_date": "25/02/2017 0 ...

init.sls

{% if grains['fqdn'] == 'server1' %}

{% set form_time_date = salt['cmd.run']('date --date="tomorrow" +"%d/%m/%Y %H:%M"') %}
{% set time_date = salt['cmd.run']('date --date="tomorrow" +%Y%m%d%H%M') %}
{% set username = pillar['client'] %}

/srv/ftp/users/{{ username }}:
  file.directory:
    - user: root
    - group: root
    - name: /srv/ftp/users/{{ username }}
    - mode: 755

/srv/ftp/users/{{ username }}/writeable:
  file.directory:
    - user: {{ username }}
    - group : sftpgroup
    - name: /srv/ftp/users/{{ username }}/writeable
    - mode: 755

noReadme:
  file.absent:
    - name: /srv/ftp/users/{{ username }}/README

createReadme:
  file.append:
    - name: /srv/ftp/users/{{ username }}/README
    - text :
      - "You have access to this server until:"
      - {{ form_time_date }}

del_sched:
  schedule.present:
    - function: state.apply
    - job_args:
      - prod.ftp24.del
    - job_kwargs:
       pillar:
          "client": "{{ username }}"
          "form_time_date": "{{ form_time_date }}"
    - hours: 24
    - name: {{ username }}_{{ time_date }}

{% endif %}

In del.sls line 6 you have two syntax errors. One cannot embed Jinja expressions to print to the template output within Jinja Statements. You also need a closing parenthesis ()) before the statement end token (%}).

The remaining Pillar data references look OK, but without a sample command (and output), I can't even begin to guess as to what might be going wrong with your salt/salt-call invocation.