diff --git a/artcommon/artcommonlib/constants.py b/artcommon/artcommonlib/constants.py
index 7bc1b280b..5161844e5 100644
--- a/artcommon/artcommonlib/constants.py
+++ b/artcommon/artcommonlib/constants.py
@@ -3,3 +3,4 @@
 RHCOS_RELEASES_BASE_URL = "https://releases-rhcos-art.apps.ocp-virt.prod.psi.redhat.com/storage/releases"
 BREW_HUB = "https://brewhub.engineering.redhat.com/brewhub"
 BREW_DOWNLOAD_URL = "https://download.eng.bos.redhat.com/brewroot"
+RELEASE_SCHEDULES = "https://pp.engineering.redhat.com/api/v7/releases"
diff --git a/artcommon/artcommonlib/util.py b/artcommon/artcommonlib/util.py
index 72ea48190..d75fc3c25 100644
--- a/artcommon/artcommonlib/util.py
+++ b/artcommon/artcommonlib/util.py
@@ -1,5 +1,8 @@
-import re
 from typing import OrderedDict, Optional
+from datetime import datetime
+from artcommonlib.constants import RELEASE_SCHEDULES
+import requests
+import re
 
 
 def remove_prefix(s: str, prefix: str) -> str:
@@ -85,6 +88,58 @@ def merge_objects(a, b):
     return c
 
 
+def is_future_release_date(date_str):
+    """
+    If the input date is in future then return True elase False
+    """
+    try:
+        target_date = datetime.strptime(date_str, "%Y-%m-%d")
+    except ValueError:
+        return False
+    current_date = datetime.now()
+    if target_date > current_date:
+        return True
+    else:
+        return False
+
+
+def get_assembly_release_date(assembly, group):
+    """
+    Get assembly release release date from release schedule API
+    """
+    assembly_release_date = None
+    release_schedules = requests.get(f'{RELEASE_SCHEDULES}/{group}.z/?fields=all_ga_tasks', headers={'Accept': 'application/json'})
+    for release in release_schedules.json()['all_ga_tasks']:
+        if assembly in release['name']:
+            assembly_release_date = datetime.strptime(release['date_start'], "%Y-%m-%d").strftime("%Y-%b-%d")
+            break
+    return assembly_release_date
+
+
+def get_inflight(assembly, group):
+    """
+    Get inflight release name from current assembly release
+    """
+    inflight_release = None
+    assembly_release_date = get_assembly_release_date(assembly, group)
+    if not assembly_release_date:
+        raise ValueError(f'Assembly release date not found for {assembly}')
+    major, minor = get_ocp_version_from_group(group)
+    release_schedules = requests.get(f'{RELEASE_SCHEDULES}/openshift-{major}.{minor-1}.z/?fields=all_ga_tasks', headers={'Accept': 'application/json'})
+    for release in release_schedules.json()['all_ga_tasks']:
+        is_future = is_future_release_date(release['date_start'])
+        if is_future:
+            days_diff = abs((datetime.strptime(assembly_release_date, "%Y-%m-%d") - datetime.strptime(release['date_start'], "%Y-%m-%d")).days)
+            if days_diff <= 5:  # if next Y-1 release and assembly release in the same week
+                match = re.search(r'\d+\.\d+\.\d+', release['name'])
+                if match:
+                    inflight_release = match.group()
+                    break
+                else:
+                    raise ValueError(f"Didn't find in_inflight release in {release['name']}")
+    return inflight_release
+
+
 def isolate_rhel_major_from_version(version: str) -> Optional[int]:
     """
     E.g. '9.2' => 9
@@ -94,3 +149,13 @@ def isolate_rhel_major_from_version(version: str) -> Optional[int]:
     if match:
         return int(match[1])
     return None
+
+
+def get_ocp_version_from_group(group):
+    """
+    Extract ocp version from group value openshift-4.15 --> 4, 15
+    """
+    match = re.fullmatch(r"openshift-(\d+).(\d+)", group)
+    if not match:
+        raise ValueError(f"Invalid group name: {group}")
+    return int(match[1]), int(match[2])
diff --git a/pyartcd/pyartcd/pipelines/build_microshift.py b/pyartcd/pyartcd/pipelines/build_microshift.py
index 576619e05..f20e39e35 100644
--- a/pyartcd/pyartcd/pipelines/build_microshift.py
+++ b/pyartcd/pyartcd/pipelines/build_microshift.py
@@ -13,6 +13,7 @@
 import click
 
 from artcommonlib.arch_util import brew_arch_for_go_arch
+from artcommonlib.util import get_ocp_version_from_group
 from doozerlib.assembly import AssemblyTypes
 from doozerlib.util import isolate_nightly_name_components
 from ghapi.all import GhApi
@@ -54,10 +55,7 @@ def __init__(self, runtime: Runtime, group: str, assembly: str, payloads: Tuple[
         self.slack_client.bind_channel(group)
 
         # determines OCP version
-        match = re.fullmatch(r"openshift-(\d+).(\d+)", group)
-        if not match:
-            raise ValueError(f"Invalid group name: {group}")
-        self._ocp_version = (int(match[1]), int(match[2]))
+        self._ocp_version = get_ocp_version_from_group(group)
 
         # sets environment variables for Elliott and Doozer
         self._elliott_env_vars = os.environ.copy()
diff --git a/pyartcd/pyartcd/pipelines/gen_assembly.py b/pyartcd/pyartcd/pipelines/gen_assembly.py
index 5e9df56fe..62800ddba 100644
--- a/pyartcd/pyartcd/pipelines/gen_assembly.py
+++ b/pyartcd/pyartcd/pipelines/gen_assembly.py
@@ -9,7 +9,7 @@
 import click
 from ghapi.all import GhApi
 
-from artcommonlib.util import split_git_url, merge_objects
+from artcommonlib.util import split_git_url, merge_objects, get_inflight
 from pyartcd import exectools, constants, jenkins
 from pyartcd.cli import cli, click_coroutine, pass_runtime
 from pyartcd.git import GitRepository
@@ -43,7 +43,7 @@ def __init__(self, runtime: Runtime, group: str, assembly: str, data_path: str,
         self.auto_trigger_build_sync = auto_trigger_build_sync
         self.custom = custom
         self.arches = arches
-        self.in_flight = in_flight
+        self.in_flight = in_flight if in_flight else get_inflight(assembly, group)
         self.previous_list = previous_list
         self.auto_previous = auto_previous
         self.pre_ga_mode = pre_ga_mode
@@ -91,7 +91,7 @@ async def run(self):
             pr = await self._create_or_update_pull_request(assembly_definition)
 
             # Sends a slack message
-            message = f"Hi @release-artists , please review assembly definition for {self.assembly}: {pr.html_url}"
+            message = f"Hi @release-artists , please review assembly definition for {self.assembly}: {pr.html_url}\n\nthe inflight release is {self.in_flight}"
             await self._slack_client.say(message, slack_thread)
 
         except Exception as err:
diff --git a/pyartcd/pyartcd/pipelines/prepare_release.py b/pyartcd/pyartcd/pipelines/prepare_release.py
index 6c8921204..4decebb52 100644
--- a/pyartcd/pyartcd/pipelines/prepare_release.py
+++ b/pyartcd/pyartcd/pipelines/prepare_release.py
@@ -16,6 +16,7 @@
 from ruamel.yaml import YAML
 from tenacity import retry, stop_after_attempt, wait_fixed
 
+from artcommonlib.util import get_assembly_release_date
 from doozerlib.assembly import AssemblyTypes
 from elliottlib.assembly import assembly_group_config
 from elliottlib.errata import set_blocking_advisory, get_blocking_advisories
@@ -85,7 +86,7 @@ def __init__(
             if default_advisories:
                 raise ValueError("default_advisories cannot be set for a non-stream assembly.")
 
-        self.release_date = date
+        self.release_date = date if date else get_assembly_release_date(assembly, group)
         self.package_owner = package_owner or self.runtime.config["advisory"]["package_owner"]
         self._slack_client = slack_client
         self.working_dir = self.runtime.working_dir.absolute()
@@ -148,6 +149,7 @@ async def run(self):
             for ad in advisories:
                 if advisories[ad] < 0:
                     advisories[ad] = self.create_advisory(advisory_type=advisory_type, art_advisory_key=ad)
+            await self._slack_client.say_in_thread(f"Advisories created with release date {self.release_date}")
 
         await self.set_advisory_dependencies(advisories)
 
@@ -711,7 +713,7 @@ async def verify_attached_operators(self, *advisories: List[int], gather_depende
               help="The name of an assembly to rebase & build for. e.g. 4.9.1")
 @click.option("--name", metavar="RELEASE_NAME",
               help="release name (e.g. 4.6.42)")
-@click.option("--date", metavar="YYYY-MMM-DD", required=True,
+@click.option("--date", metavar="YYYY-MMM-DD",
               help="Expected release date (e.g. 2020-11-25)")
 @click.option("--package-owner", metavar='EMAIL',
               help="Advisory package owner; Must be an individual email address; May be anyone who wants random advisory spam")
diff --git a/pyartcd/pyartcd/pipelines/rebuild.py b/pyartcd/pyartcd/pipelines/rebuild.py
index a69bfdeee..eef93d324 100644
--- a/pyartcd/pyartcd/pipelines/rebuild.py
+++ b/pyartcd/pyartcd/pipelines/rebuild.py
@@ -15,6 +15,7 @@
 import yaml
 from aioredlock import LockError
 from doozerlib.assembly import AssemblyTypes
+from artcommonlib.util import get_ocp_version_from_group
 from pyartcd import constants, exectools, locks, jenkins
 from pyartcd.cli import cli, click_coroutine, pass_runtime
 from pyartcd.record import parse_record_log
@@ -52,10 +53,7 @@ def __init__(self, runtime: Runtime, group: str, assembly: str,
         self.ocp_build_data_url = ocp_build_data_url
 
         # determines OCP version
-        match = re.fullmatch(r"openshift-(\d+).(\d+)", group)
-        if not match:
-            raise ValueError(f"Invalid group name: {group}")
-        self._ocp_version = (int(match[1]), int(match[2]))
+        self._ocp_version = get_ocp_version_from_group(group)
 
         # sets environment variables for Doozer
         self._doozer_env_vars = os.environ.copy()
diff --git a/pyartcd/tests/pipelines/test_gen_assembly.py b/pyartcd/tests/pipelines/test_gen_assembly.py
index b0565fb8d..e607d8e6e 100644
--- a/pyartcd/tests/pipelines/test_gen_assembly.py
+++ b/pyartcd/tests/pipelines/test_gen_assembly.py
@@ -13,7 +13,7 @@ def test_get_nightlies(self, cmd_gather_async: AsyncMock):
         runtime = MagicMock()
         pipeline = GenAssemblyPipeline(runtime, "openshift-4.12", "4.12.99", "https://example.com/ocp-build-data.git",
                                        nightlies=(), allow_pending=False, allow_rejected=False,
-                                       allow_inconsistency=False, custom=False, arches=(), in_flight=None,
+                                       allow_inconsistency=False, custom=False, arches=(), in_flight="4.11.88",
                                        previous_list=(), auto_previous=True, auto_trigger_build_sync=False,
                                        pre_ga_mode="none")
         actual = asyncio.run(pipeline._get_nightlies())
@@ -97,7 +97,7 @@ def test_create_or_update_pull_request(self, git_repo: MagicMock, yaml: MagicMoc
         }})
         pipeline = GenAssemblyPipeline(runtime, "openshift-4.12", "4.12.99", "https://example.com/ocp-build-data.git",
                                        nightlies=(), allow_pending=False, allow_rejected=False,
-                                       allow_inconsistency=False, custom=False, arches=(), in_flight=None,
+                                       allow_inconsistency=False, custom=False, arches=(), in_flight="4.11.88",
                                        previous_list=(), auto_previous=True, auto_trigger_build_sync=False,
                                        pre_ga_mode="none")
         pipeline._working_dir = Path("/path/to/working")
@@ -147,7 +147,7 @@ async def test_run(self, get_nightlies: AsyncMock, _gen_assembly_from_releases:
 
         pipeline = GenAssemblyPipeline(runtime, "openshift-4.12", "4.12.99", "https://example.com/ocp-build-data.git",
                                        nightlies=(), allow_pending=False, allow_rejected=False,
-                                       allow_inconsistency=False, custom=False, arches=(), in_flight=None,
+                                       allow_inconsistency=False, custom=False, arches=(), in_flight="4.11.88",
                                        previous_list=(), auto_previous=True, auto_trigger_build_sync=False,
                                        pre_ga_mode="none")
         pipeline._working_dir = Path("/path/to/working")