Add method to fix document creation date

2 files changed, 17 insertions, 1 deletions

diff --git a/def.go b/def.go
index f1c8d7b..50a3f70 100644
--- a/def.go
+++ b/def.go
@@ -19,6 +19,7 @@ package gofpdf
 import (
 	"bytes"
 	"io"
+	"time"
 )
 
 // Version of FPDF from which this package is derived
@@ -216,6 +217,7 @@ type Fpdf struct {
 	author           string                    // author
 	keywords         string                    // keywords
 	creator          string                    // creator
+	creationDate     time.Time                 // override for dcoument CreationDate value
 	aliasNbPagesStr  string                    // alias for total number of pages
 	pdfVersion       string                    // PDF version number
 	fontDirStr       string                    // location of font definition files
diff --git a/fpdf.go b/fpdf.go
index f1c6b58..efe5274 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -2986,6 +2986,14 @@ func (f *Fpdf) outf(fmtStr string, args ...interface{}) {
 	f.out(sprintf(fmtStr, args...))
 }
 
+// SetCreationDate fixes the document's internal CreationDate value. By
+// default, the time when the document is generated is used for this value.
+// This method is typically only used for testing purposes. Specify a
+// zero-value time to revert to the default behavior
+func (f *Fpdf) SetCreationDate(tm time.Time) {
+	f.creationDate = tm
+}
+
 func (f *Fpdf) putpages() {
 	var wPt, hPt float64
 	var pageSize SizeType
@@ -3400,6 +3408,7 @@ func (f *Fpdf) putresources() {
 }
 
 func (f *Fpdf) putinfo() {
+	var tm time.Time
 	f.outf("/Producer %s", f.textstring("FPDF "+cnFpdfVersion))
 	if len(f.title) > 0 {
 		f.outf("/Title %s", f.textstring(f.title))
@@ -3416,7 +3425,12 @@ func (f *Fpdf) putinfo() {
 	if len(f.creator) > 0 {
 		f.outf("/Creator %s", f.textstring(f.creator))
 	}
-	f.outf("/CreationDate %s", f.textstring("D:"+time.Now().Format("20060102150405")))
+	if f.creationDate.IsZero() {
+		tm = time.Now()
+	} else {
+		tm = f.creationDate
+	}
+	f.outf("/CreationDate %s", f.textstring("D:"+tm.Format("20060102150405")))
 }
 
 func (f *Fpdf) putcatalog() {