diff --git a/larigira/timeform_cron.py b/larigira/timeform_cron.py
new file mode 100644
index 0000000..d435c91
--- /dev/null
+++ b/larigira/timeform_cron.py
@@ -0,0 +1,39 @@
+import logging
+
+from flask_wtf import Form
+from wtforms import StringField, validators, SubmitField, ValidationError
+from croniter import croniter
+
+log = logging.getLogger(__name__)
+
+
+class CronAlarmForm(Form):
+    nick = StringField(
+        "Alarm nick",
+        validators=[validators.required()],
+        description="A simple name to recognize this alarm",
+    )
+    cron_format = StringField(
+        "cron-like format",
+        validators=[validators.required()],
+        description="the frequency specification, as in the `cron` command",
+    )
+    submit = SubmitField("Submit")
+
+    def populate_from_timespec(self, timespec):
+        if "nick" in timespec:
+            self.nick.data = timespec["nick"]
+        if "cron_format" in timespec:
+            self.cron_format.data = timespec["cron_format"]
+
+    def validate_cron_format(self, field):
+        if not croniter.is_valid(field.data):
+            raise ValidationError("formato di cron non valido")
+
+
+def cronalarm_receive(form):
+    return {
+        "kind": "cron",
+        "nick": form.nick.data,
+        "cron_format": form.cron_format.data,
+    }
diff --git a/larigira/timegen_cron.py b/larigira/timegen_cron.py
index 8745a43..44b911c 100644
--- a/larigira/timegen_cron.py
+++ b/larigira/timegen_cron.py
@@ -9,6 +9,9 @@ log = logging.getLogger("time-cron")
 
 
 class CronAlarm(Alarm):
+
+    description = "Frequency specified by cron-like format. nerds preferred"
+
     def __init__(self, obj):
         super().__init__()
 
diff --git a/setup.py b/setup.py
index 05b0405..ef27f79 100644
--- a/setup.py
+++ b/setup.py
@@ -79,10 +79,12 @@ setup(name='larigira',
           'larigira.timeform_create': [
               'single = larigira.timeform_base:SingleAlarmForm',
               'frequency = larigira.timeform_base:FrequencyAlarmForm',
+              'cron = larigira.timeform_cron:CronAlarmForm',
           ],
           'larigira.timeform_receive': [
               'single = larigira.timeform_base:singlealarm_receive',
               'frequency = larigira.timeform_base:frequencyalarm_receive',
+              'cron = larigira.timeform_cron:cronalarm_receive',
           ],
           'larigira.audioform_create': [
               'static = larigira.audioform_static:StaticAudioForm',