Add "date to string" helper

freqtrade/util/__init__.py

@@ -1,5 +1,5 @@
 from freqtrade.util.datetime_helpers import (dt_floor_day, dt_from_ts, dt_humanize, dt_now, dt_ts,
-                                             dt_utc, format_ms_time, shorten_date)
+                                             dt_utc, format_date, format_ms_time, shorten_date)
 from freqtrade.util.ft_precise import FtPrecise
 from freqtrade.util.periodic_cache import PeriodicCache
 from freqtrade.util.template_renderer import render_template, render_template_with_fallback  # noqa
@@ -12,6 +12,7 @@ __all__ = [
     'dt_now',
     'dt_ts',
     'dt_utc',
+    'format_date',
     'format_ms_time',
     'FtPrecise',
     'PeriodicCache',

freqtrade/util/datetime_helpers.py

@@ -4,6 +4,8 @@ from typing import Optional
 
 import arrow
 
+from freqtrade.constants import DATETIME_PRINT_FORMAT
+
 
 def dt_now() -> datetime:
     """Return the current datetime in UTC."""
@@ -63,6 +65,17 @@ def dt_humanize(dt: datetime, **kwargs) -> str:
     return arrow.get(dt).humanize(**kwargs)
 
 
+def format_date(date: Optional[datetime]) -> str:
+    """
+    Return a formatted date string.
+    Returns an empty string if date is None.
+    :param date: datetime to format
+    """
+    if date:
+        return date.strftime(DATETIME_PRINT_FORMAT)
+    return ''
+
+
 def format_ms_time(date: int) -> str:
     """
     convert MS date to readable format.

tests/utils/test_datetime_helpers.py

@@ -4,7 +4,7 @@ import pytest
 import time_machine
 
 from freqtrade.util import (dt_floor_day, dt_from_ts, dt_humanize, dt_now, dt_ts, dt_utc,
-                            format_ms_time, shorten_date)
+                            format_date, format_ms_time, shorten_date)
 
 
 def test_dt_now():
@@ -70,3 +70,14 @@ def test_format_ms_time() -> None:
     # Date 2017-12-13 08:02:01
     date_in_epoch_ms = 1513152121000
     assert format_ms_time(date_in_epoch_ms) == res.astimezone(None).strftime('%Y-%m-%dT%H:%M:%S')
+
+
+def test_format_date() -> None:
+
+    date = datetime(2023, 9, 1, 5, 2, 3, 455555, tzinfo=timezone.utc)
+    assert format_date(date) == '2023-09-01 05:02:03'
+    assert format_date(None) == ''
+
+    date = datetime(2021, 9, 30, 22, 59, 3, 455555, tzinfo=timezone.utc)
+    assert format_date(date) == '2021-09-30 22:59:03'
+    assert format_date('') == ''