Allow 'today' for 'date' field values.

doc/MANUAL.md

@@ -836,13 +836,16 @@ enter a date. Depending on the browser's support for HTML5 forms, the input
 field may have a pop-out calendar from which the user can select a date. 
 
 The date must be entered, and will be passed to the callback, in the form
-YYYY-MM-DD.
+`YYYY-MM-DD`.
 
 The `date` field type supports the following additional options:
 
-- **`min`**: The minimum allowed date (format: a string YYYY-MM-DD)
-- **`max`**: The maximum allowed date (format: a string YYYY-MM-DD)
-- **`default_value`**: The default value.
+- **`min`**: The minimum allowed date (format: a string `YYYY-MM-DD`)  or
+  "`today`" for today.
+- **`max`**: The maximum allowed date (format: a string `YYYY-MM-DD`) or
+  "`today`" for today.
+- **`default_value`**: The default value (format: a string `YYYY-MM-DD`) or
+  "`today`" for today.
 
 For example:
 
@@ -858,6 +861,20 @@ For example:
     ]
     ...
 
+Must start today or in the future (Default value today):
+
+    ...
+    "fields": [
+        {
+          "name": "startdate",
+          "title": "Start date",
+          "type": "date",
+          "min": "today",
+          "default_value": "today"
+        }
+    ]
+    ...
+
 ### <a name="field_types_radio">Radio</a>
 
 The `radio` field type lets the user pick one option from a list of options. 

src/formrender.py

@@ -4,6 +4,9 @@
 FormRender takes care of the rendering of forms to HTML.
 """
 
+import datetime
+
+
 HTML_FIELD = u'''
   <li class="{classes}">
     <p class="form-field-title">{title}</p>
@@ -140,6 +143,12 @@ class FormRender(object):
         Render a date field to HTML.
         """
         tpl = self.field_tpl['date']
+        if value == "today":
+            value = datetime.datetime.now().strftime("%Y-%m-%d")
+        if minval == "today":
+            minval = datetime.datetime.now().strftime("%Y-%m-%d")
+        if maxval == "today":
+            maxval = datetime.datetime.now().strftime("%Y-%m-%d")
         return tpl.format(name=name, value=value, minval=minval, maxval=maxval,
                           required=required, classes=classes, style=style)