diff --git a/silkaj/cert.py b/silkaj/cert.py
index 595c3bb401c6344c14cafed7e5cab471d3204c86..3c3a30940fe3586cfd829ccf7216681da1f61240 100644
--- a/silkaj/cert.py
+++ b/silkaj/cert.py
@@ -17,7 +17,8 @@ along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
 
 import sys
 import click
-from time import time
+from pendulum import from_timestamp, now
+
 from tabulate import tabulate
 from duniterpy.api import bma
 from duniterpy.documents import BlockUID, block_uid, Identity, Certification
@@ -28,7 +29,7 @@ from silkaj.network_tools import ClientInstance
 from silkaj.blockchain_tools import BlockchainParams, HeadBlock
 from silkaj.license import license_approval
 from silkaj import wot, tui
-from silkaj.constants import SUCCESS_EXIT_STATUS
+from silkaj.constants import SUCCESS_EXIT_STATUS, DATE, ALL
 from silkaj.crypto_tools import is_pubkey_and_check
 
 
@@ -108,8 +109,8 @@ async def pre_checks(client, issuer_pubkey, pubkey_to_certify):
             # ĞT: 0<–>4.8m - 4.8m + 12.5d
             renewable = cert["expiresIn"] - params["sigValidity"] + params["sigReplay"]
             if renewable > 0:
-                renewable_date = tui.convert_time(time() + renewable, "date")
-                message_exit("Certification renewable the " + renewable_date)
+                renewable_date = now().add(seconds=renewable).format(DATE)
+                message_exit("Certification renewable from " + renewable_date)
 
     # Check if the certification is already in the pending certifications
     for pending_cert in req["pendingCerts"]:
@@ -127,9 +128,8 @@ async def certification_confirmation(
     idty_timestamp = idty_to_certify["meta"]["timestamp"]
     block_uid_idty = block_uid(idty_timestamp)
     block = await client(bma.blockchain.block, block_uid_idty.number)
-    block_uid_date = (
-        ": #" + idty_timestamp[:15] + "… " + tui.convert_time(block["time"], "all")
-    )
+    timestamp_date = from_timestamp(block["time"], tz="local").format(ALL)
+    block_uid_date = f": #{idty_timestamp[:15]}… {timestamp_date}"
     cert.append(["ID", issuer["uid"], "–>", idty_to_certify["uid"] + block_uid_date])
     cert.append(
         [
@@ -140,8 +140,8 @@ async def certification_confirmation(
         ]
     )
     params = await BlockchainParams().params
-    cert_begins = tui.convert_time(time(), "date")
-    cert_ends = tui.convert_time(time() + params["sigValidity"], "date")
+    cert_begins = now().format(DATE)
+    cert_ends = now().add(seconds=params["sigValidity"]).format(DATE)
     cert.append(["Valid", cert_begins, "—>", cert_ends])
     click.echo(tabulate(cert, tablefmt="fancy_grid"))
     if not ctx.obj["DISPLAY_DOCUMENT"]: