diff --git a/kontr_emails.py b/kontr_emails.py
index c8ede89..4a477d7 100644
--- a/kontr_emails.py
+++ b/kontr_emails.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 
+import datetime
 from mailbox import mbox, mboxMessage
 import re
 from typing import Tuple
@@ -10,6 +11,8 @@ class Parser:
     INFO_REGEX = re.compile(r"(\d{6}) \| (x\S*)\s*")
     SUBMISSION_REGEX = re.compile(r"adresář:\s+\S*\/(\S*)\s*")
     POINTS_REGEX = re.compile(r"\*\scelkový počet bodů\s+((\d|\.)*)\s*")
+    DATE_FORMAT = "%Y_%m%d_%H%M%S"
+    OFFSET_FOR_CORRECTION = datetime.timedelta(days=8)
 
     @staticmethod
     def get_match_from_mail(regex: re.Pattern, mail: mboxMessage) -> re.Match:
@@ -35,9 +38,20 @@ class Parser:
         match = Parser.get_match_from_mail(Parser.POINTS_REGEX, mail)
         return float(match.group(1))
 
-    def __init__(self, path: str) -> None:
-        self.path = path
+    def submitted_before_deadline(self, submission: str) -> bool:
+        submitted = datetime.datetime.strptime(
+            submission.split("/")[-1][-16:], Parser.DATE_FORMAT
+        )
+        return self.deadline > submitted
+
+    def __init__(self, path: str, deadline: str, correction: bool = False) -> None:
         self.box = mbox(path)
+        self.deadline = datetime.datetime.strptime(deadline, Parser.DATE_FORMAT)
+        if correction:
+            # in case of correction pass the date of
+            # submitting review to IS for automatic computation
+            self.deadline = self.deadline.replace(hour=0, minute=0, second=0)
+            self.deadline += Parser.OFFSET_FOR_CORRECTION
 
 
 if __name__ == "__main__":