updates CFP OPEN footer to use time comparions

The existing footer takes the current time (build time), casts it to a
string, and compares it with the CFP start/end times which are also
being re-cast to strings here (twice!).

In order to allow us to use timezones as part of our comparison and not
have the formatting involved in comparisons, use the `time` template
function and directly compare against `now` without typecasting.

ref https://gohugo.io/functions/time/
ref https://gohugo.io/functions/now/

Author: tgross

exampleSite/data/events/2018-singapore.yml

@@ -11,7 +11,7 @@ enddate: 2018-10-12 # The end date of your event. Leave blank if you don't have
 
 # Leave CFP dates blank if you don't know yet, or set all three at once.
 cfp_date_start: 2018-07-05  # start accepting talk proposals.
-cfp_date_end: 2018-08-31  # close your call for proposals.
+cfp_date_end: 2018-08-31T00:00:00+08:00  # close your call for proposals.
 cfp_date_announce: 2018-09-11  # inform proposers of status
 
 cfp_open: "false"
@@ -277,4 +277,3 @@ program:
     date: 2018-10-12
     start_time: "16:45"
     end_time: "17:00"
-

layouts/partials/footer.html

@@ -47,7 +47,7 @@ <h2 class="footer-heading">{{ dateFormat "02 January, 2006" .Date }}</h2>
       <h3 class="footer-nav">CFP OPEN</h3>
       {{- range sort $.Site.Data.events "startdate" -}}
         {{- if .cfp_date_end -}}
-          {{- if and (ge (dateFormat "2006-01-02" (dateFormat "2006-01-02" now)) (dateFormat "2006-01-02" .cfp_date_start)) (ge (dateFormat "2006-01-02" .cfp_date_end) (dateFormat "2006-01-02" (dateFormat "2006-01-02" now))) -}}
+          {{- if and (ge now (time .cfp_date_start)) (ge (time .cfp_date_end) now) -}}
             <a href = "{{ (printf "events/%s" .name) | absURL }}" class = "footer-content">{{ .city }}</a><br />
           {{- end -}} {{/* end: date is now or afterwards */}}
         {{- end -}} {{/* end: if .cfp_date_end */}}