diff --git a/bot.py b/bot.py
index f17810f..beab2e4 100644
--- a/bot.py
+++ b/bot.py
@@ -8,7 +8,7 @@ import logging
 import requests
 import schedule
 
-logging.basicConfig(format='%(levelname)s %(name)s:%(message)s', level=logging.DEBUG)
+logging.basicConfig(format='%(asctime)s %(levelname)s %(name)s:%(message)s', level=logging.DEBUG, datefmt="%Y.%m.%d %H:%M:%S")
 log = logging.getLogger(__name__)
 
 def parse_time(string):
@@ -73,7 +73,11 @@ def post_plot(config):
 	from plot import get_plot
 	with NamedTemporaryFile() as target:
 		image_url = 'https://api.telegram.org/bot{token}/sendPhoto'.format(token=config['token'])
-		files = {'photo': get_plot(target)}
+		photo, last = get_plot(target)
+		files = {'photo': photo}
+		if last + datetime.timedelta(days=1) < datetime.datetime.today():
+			log.info("skipping image, no new updates...")
+			return
 		for chat in config['groups']:
 			files['photo'].seek(0)
 			values = {"chat_id":config['groups'][chat]}
diff --git a/plot.py b/plot.py
index a436471..886375e 100644
--- a/plot.py
+++ b/plot.py
@@ -49,7 +49,7 @@ def plot(raw, target="wiai.png"):
 	plt.figtext(0.5, 0.25, "created: "+str(date.today()), ha="center")
 	plt.figtext(0.5, 0.2, str(first[0])+" → "+str(last[0]), ha="center")
 	plt.savefig(target, format="PNG", transparent=True, bbox_inches="tight")
-	return target
+	return target, last[0]
 
 
 def local(target):
@@ -59,7 +59,7 @@ def local(target):
 
 
 def prod(target):
-	plot(requests.get('https://isfswiaiopen.wiai.de/log').json(), target=target)
+	return plot(requests.get('https://isfswiaiopen.wiai.de/log').json(), target=target)
 
 def get_plot(target):
 	return plot(requests.get('https://isfswiaiopen.wiai.de/log').json(), target=target)