diff --git a/README.md b/README.md
index 84ea10d..e6f6d43 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ You can use following placeholders:
 
 - `%date`
 - `%time` *– format taken from `time_format`*
+- `%time_format<format>` *– custom datetime format using Python strftime codes*
 - `%model` *– full name of model file*
 - `%basemodelname` *– name of model (without file extension)*
 - `%seed`
@@ -48,3 +49,26 @@ Example:
 | `filename` value | Result file name |
 | --- | --- |
 | `%time-%basemodelname-%cfg-%steps-%sampler_name-%scheduler-%seed` | `2023-11-16-131331-Anything-v4.5-pruned-mergedVae-7.0-25-dpm_2-normal-1_01.png` |
+| `%time_format<%Y%m%d_%H%M%S>-%seed` | `20231116_131331-1.png` |
+| `%time_format<%B %d, %Y> %basemodelname` | `November 16, 2023 Anything-v4.5.png` |
+| `img_%time_format<%Y-%m-%d>_%seed` | `img_2023-11-16_1.png` |
+
+**Common strftime format codes for `%time_format<format>`:**
+
+| Code | Meaning | Example |
+|------|---------|---------|
+| `%Y` | Year (4-digit) | 2023 |
+| `%y` | Year (2-digit) | 23 |
+| `%m` | Month (01-12) | 11 |
+| `%B` | Month name (full) | November |
+| `%b` | Month name (short) | Nov |
+| `%d` | Day (01-31) | 16 |
+| `%H` | Hour 24h | 13 |
+| `%I` | Hour 12h | 01 |
+| `%M` | Minute | 13 |
+| `%S` | Second | 31 |
+| `%p` | AM/PM | PM |
+| `%A` | Weekday (full) | Thursday |
+| `%a` | Weekday (short) | Thu |
+| `%F` | YYYY-MM-DD | 2023-11-16 |
+| `%T` | HH:MM:SS | 13:13:31 |
diff --git a/nodes.py b/nodes.py
index a973be4..c84f508 100644
--- a/nodes.py
+++ b/nodes.py
@@ -41,6 +41,25 @@ def get_timestamp(time_format: str) -> str:
 
     return timestamp
 
+def apply_custom_time_format(filename: str) -> str:
+    """
+    Replace %time_format<strftime_format> patterns with formatted datetime.
+    Example: %time_format<%Y-%m-%d> becomes 2026-01-17
+    """
+    now = datetime.now()
+    # Pattern to match %time_format<XXX> where XXX is any strftime format string
+    # Use negative lookahead to exclude %time_format itself from variable delimiters
+    pattern = r'%time_format<([^>]*)>'
+    def replace_format(match):
+        format_str = match.group(1)
+        try:
+            return now.strftime(format_str)
+        except:
+            # If format is invalid, return original
+            return match.group(0)
+
+    return re.sub(pattern, replace_format, filename)
+
 def save_json(image_info: dict[str, Any] | None, filename: str) -> None:
     try:
         workflow = (image_info or {}).get('workflow')
@@ -53,6 +72,8 @@ def save_json(image_info: dict[str, Any] | None, filename: str) -> None:
         print(f'Failed to save workflow as json due to: {e}, proceeding with the remainder of saving execution')
 
 def make_pathname(filename: str, width: int, height: int, seed: int, modelname: str, counter: int, time_format: str, sampler_name: str, steps: int, cfg: float, scheduler_name: str, denoise: float, clip_skip: int, custom: str) -> str:
+    # Process custom time_format patterns first
+    filename = apply_custom_time_format(filename)
     filename = filename.replace("%date", get_timestamp("%Y-%m-%d"))
     filename = filename.replace("%time", get_timestamp(time_format))
     filename = filename.replace("%model", parse_checkpoint_name(modelname))
@@ -234,7 +255,7 @@ class ImageSaverSimple:
         return {
             "required": {
                 "images":                ("IMAGE",    {                                                             "tooltip": "image(s) to save"}),
-                "filename":              ("STRING",   {"default": '%time_%basemodelname_%seed', "multiline": False, "tooltip": "filename (available variables: %date, %time, %model, %width, %height, %seed, %counter, %sampler_name, %steps, %cfg, %scheduler_name, %basemodelname, %denoise, %clip_skip)"}),
+                "filename":              ("STRING",   {"default": '%time_%basemodelname_%seed', "multiline": False, "tooltip": "filename (available variables: %date, %time, %time_format<format>, %model, %width, %height, %seed, %counter, %sampler_name, %steps, %cfg, %scheduler_name, %basemodelname, %denoise, %clip_skip)"}),
                 "path":                  ("STRING",   {"default": '', "multiline": False,                           "tooltip": "path to save the images (under Comfy's save directory)"}),
                 "extension":             (['png', 'jpeg', 'jpg', 'webp'], {                                         "tooltip": "file extension/type to save image as"}),
                 "lossless_webp":         ("BOOLEAN",  {"default": True,                                             "tooltip": "if True, saved WEBP files will be lossless"}),
@@ -306,7 +327,7 @@ class ImageSaver:
         return {
             "required": {
                 "images":                ("IMAGE",   {                                                             "tooltip": "image(s) to save"}),
-                "filename":              ("STRING",  {"default": '%time_%basemodelname_%seed', "multiline": False, "tooltip": "filename (available variables: %date, %time, %model, %width, %height, %seed, %counter, %sampler_name, %steps, %cfg, %scheduler, %basemodelname, %denoise, %clip_skip)"}),
+                "filename":              ("STRING",  {"default": '%time_%basemodelname_%seed', "multiline": False, "tooltip": "filename (available variables: %date, %time, %time_format<format>, %model, %width, %height, %seed, %counter, %sampler_name, %steps, %cfg, %scheduler_name, %basemodelname, %denoise, %clip_skip)"}),
                 "path":                  ("STRING",  {"default": '', "multiline": False,                           "tooltip": "path to save the images (under Comfy's save directory)"}),
                 "extension":             (['png', 'jpeg', 'jpg', 'webp'], {                                        "tooltip": "file extension/type to save image as"}),
             },