Advance min dates of departure and arrival one day

Apparently, expecting people to book at least one day in advance is
being “too optimistic”.

pkg/template/render.go

@@ -107,12 +107,12 @@ func mustRenderLayout(w io.Writer, user *auth.User, company *auth.Company, templ
 		"formatDate": func(time time.Time) template.HTML {
 			return template.HTML(`<time datetime="` + time.Format(database.ISODateFormat) + `">` + time.Format("02/01/2006") + "</time>")
 		},
+		"today": func() string {
+			return time.Now().Format(database.ISODateFormat)
+		},
 		"tomorrow": func() string {
 			return time.Now().AddDate(0, 0, 1).Format(database.ISODateFormat)
 		},
-		"overmorrow": func() string {
-			return time.Now().AddDate(0, 0, 2).Format(database.ISODateFormat)
-		},
 		"queryEscape": func(s string) string {
 			return url.QueryEscape(s)
 		},

web/templates/public/booking.gohtml

@@ -128,7 +128,7 @@
                     <label>
                         {{( pgettext "Arrival date" "input" )}}<br>
                         <input type="date" required
-                               min="{{ tomorrow }}"
+                               min="{{ today }}"
                                name="{{ .Name }}" value="{{ .Val }}" {{ template "error-attrs" . }}
                         ><br>
                     </label>
@@ -138,7 +138,7 @@
                     <label>
                         {{( pgettext "Departure date" "input" )}}<br>
                         <input type="date" required
-                               min="{{ overmorrow }}"
+                               min="{{ tomorrow }}"
                                name="{{ .Name }}" value="{{ .Val }}" {{ template "error-attrs" . }}
                         ><br>
                     </label>

web/templates/public/campsite/type.gohtml

@@ -40,13 +40,13 @@
             <label>
                 {{( pgettext "Check-in Date" "input")}}
                 <br>
-                <input name="arrival_date" type="date" min="{{ tomorrow }}" required>
+                <input name="arrival_date" type="date" min="{{ today }}" required>
                 <br>
             </label>
             <label>
                 {{( pgettext "Check-out Date" "input")}}
                 <br>
-                <input name="departure_date" type="date" min="{{ overmorrow }}"
+                <input name="departure_date" type="date" min="{{ tomorrow }}"
                        data-min-nights="{{ .MinNights}}" data-max-nights="{{ .MaxNights }}"
                 >
                 <br>