diff --git a/src/FileStreamRotator.ts b/src/FileStreamRotator.ts
index 4a55593..33b9fef 100644
--- a/src/FileStreamRotator.ts
+++ b/src/FileStreamRotator.ts
@@ -68,7 +68,7 @@ export default class FileStreamRotator extends EventEmitter {
         }
         config.auditSettings = auditSettings
 
-        config.rotationSettings = DefaultOptions.rotationSettings({filename: options.filename, extension: options.extension})
+        config.rotationSettings = DefaultOptions.rotationSettings({ filename: options.filename, extension: options.extension })
         if (options.date_format && !options.frequency){
             config.rotationSettings.frequency = Frequency.date
         } else {
@@ -78,6 +78,9 @@ export default class FileStreamRotator extends EventEmitter {
         if (options.date_format) {
             config.rotationSettings.format = options.date_format
         } 
+        if (typeof options.getDateString === 'function') {
+          config.rotationSettings.getDateString = options.getDateString
+        }
         config.rotationSettings.utc = options.utc ?? false
         switch(options.frequency){
             case "daily":
diff --git a/src/Rotator.ts b/src/Rotator.ts
index 5c0cbb7..7ae5727 100644
--- a/src/Rotator.ts
+++ b/src/Rotator.ts
@@ -183,6 +183,10 @@ export default class Rotator {
     getDateString(date?: Date): string {
         let _date: Date = date || new Date()
 
+        if (typeof this.settings.getDateString === 'function') {
+          return this.settings.getDateString(_date);
+        }
+
         let components: DateComponents = Rotator.getDateComponents(_date, this.settings.utc)
 
         let format = this.settings.format
diff --git a/src/types.d.ts b/src/types.d.ts
index 16fcabd..db7a95d 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -21,6 +21,7 @@ export type RotationSettings = {
     format?: string
     utc: boolean
     extension?: string
+    getDateString(date?: Date): string
 }
 
 export type FileOptions = {
@@ -89,6 +90,9 @@ export type FileStreamRotatorOptions = {
     symlink_name?: string
     /** Use specified hashing algorithm for audit. Defaults to 'md5'. Use 'sha256' for FIPS compliance. */
     audit_hash_type?: "md5" | "sha256"
+
+    /** use this to define your filename with date */
+    getDateString?: (date?: Date) => string
 }
 
 export type FileStreamRotatorConfig = {