How to insert current date in email subject line in Outlook?
After you have dealt with all the tasks mentioned in a received message, you may want to make a mark to the email just like create a note for this email to remind yourself that this message was done on a certain date. Actually, you can mark the email as done by inserting the current modified date in the email subject line. To know more detailed information about inserting the current date in an email subject line, please look at the following tutorial.
Insert current date in email subject line with directly typing in
Insert current date in email subject line with copying and pasting
Insert current date in email subject line with VBA code
Automatically insert current date in subject line when creating new email
Insert current date in email subject line with directly typing in
You can directly insert the current date by typing the date in the subject field.
1. Open the email message that you want to insert the current date in the subject line.
2. Place the cursor on the "Subject" field, and then type in the current date.

3. Click the "Save" button, or press "Ctrl + S" keys to save the changes.
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Insert current date in email subject line with copying and pasting
You can insert the current date or time into the mail body by using the shortcut keys and then copy and paste it to the email subject line, please do as follows.
1. Open the email message that you want to insert the current date in the subject line.
2. In the message dialog, please click "Actions" > "Edit Message" in the "Move" group under the "Message" tab. See screenshot:

3. Click on the email body, and press "Alt + Shift + D" simultaneously on the keyboard. If you also want to insert the current time, please press "Alt + Shift + T".
4. After clicking the shortcut keys, the current date will be automatically inserted in the email body. Copy and paste the date to the "Subject" field before the old subject. See screenshot:

5. Then click the "Save" button, or press "Ctrl + S" keys to save the changes.
Insert current date in email subject line with VBA code
Besides the above two methods, you can easily insert the current date in the email subject field without opening it by using VBA code.
1. Select an email message that you want to insert the current date in its subject field.
2. Press "Alt + F11" to open the "Microsoft Visual Basic for Applications" dialog.
3. Double click on "Project1" > "Microsoft Outlook Object" > "ThisOutlookSession" in the left pane. See screenshot:

4. Then copy and paste the following VBA code to the VBA editor.
VBA: Insert current date in the email subject line
Sub SelectedMailItemsSubjectWithDate()
Dim MItem As MailItem
On Error GoTo ExitPos
For Each MItem In ActiveExplorer.Selection
MItem.Subject = Date & " " & MItem.Subject
Next
ExitPos:
End Sub
5. Then click the "Run" button or press "F5" to run the VBA code. And close the "Microsoft Visual Basic for Applications".
6. Press "Ctrl + S" to save the changes for the email. And the current date has been added to your selected email subject line.
Note: The VBA code was successfully tested in Outlook 2007, 2010, and 2013.
Automatically insert current date in subject line when creating new email
This section will show you how to automatically add the current date in the subject line of a newly created email with the "Add date into subject when creating new email" utility of "Kutools for Outlook".
1. You need to enable this "Add date into subject when new email" utility firstly. Please click "Kutools" > "Options". See screenshot:

2. In the "Options" dialog box, check the "Add date into subject when new email" box under the "New" tab, and then click the "OK" button.

Note: You can click the "Date Format" button to customize the date/datetime format based on your needs.
From now on, when you create a new email message in Outlook, the current date will be inserted automatically into the subject line.

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