diff --git a/dandi/cli/command.py b/dandi/cli/command.py
index bc2ef2e80..87a6c618f 100644
--- a/dandi/cli/command.py
+++ b/dandi/cli/command.py
@@ -99,7 +99,7 @@ def main(ctx, log_level, pdb=False):
 
     logdir = platformdirs.user_log_dir("dandi-cli", "dandi")
     logfile = os.path.join(
-        logdir, f"{datetime.now(timezone.utc):%Y%m%d%H%M%SZ}-{os.getpid()}.log"
+        logdir, f"{datetime.now(timezone.utc):%Y.%m.%d.%H.%M.%SZ}-{os.getpid()}.log"
     )
     os.makedirs(logdir, exist_ok=True)
     handler = logging.FileHandler(logfile, encoding="utf-8")