SMTP Time Stamp Issue using WiFiS3.h

[jeff7gio]

I've run the Set_Time.ino example from the IDE and find email date field in the header is not correct. This field is picked up by Outlook 365 and displays an 1899 year date as my gmt offset is negative. This error appears corrected by not using the smtp.setSystemTime() function, so far as the email clients are concerned, but this of course generates an ESP SMTP error. What might I be able to try to sort this out? Thks

These are ending lines of the gmail header, both with and without setting the smtp time.

Setting ESP SMTP time

Message-ID: [email protected]
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
From: ESP Mail <@gmail.com>
To: Someone <@gmail.com>
Subject: Test sending plain text Email (#esp_mail_current_time)
Date: Sun, 00 Jan 1900 00:00:00 +0000
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8";
Content-transfer-encoding: 7bit

This is simple plain text message

Sent September 05, 2024 07:11:14

Not Setting ESP SMTP time

Message-ID: [email protected]
Date: Thu, 05 Sep 2024 03:58:20 -0700 (PDT)
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
From: ESP Mail <@gmail.com>
To: Someone <@gmail.com>
Subject: Test sending plain text Email (#esp_mail_current_time)
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8";
Content-transfer-encoding: 7bit

This is simple plain text message

Sent January 01, 1970 00:03:55

[mobizt]

The function setSystemTime stores the UNIX timestamp and GMT offset which will be converted to the RFC 2822 time string when sending the message by the C++ function strftime.

There is no error if you provide the valid timestamp and GMT offset to that function.

You should check the RFC 2822 date with MailClient.Time.getDateTimeString().

Library cannot detect your device (UNO R4 WiFi) system time as in ESP and Raspberry Pi Pico devices, then the internal timestamp and GMT offset will always be 0 and strftime will return time in 1970 and the result you are posting above will not be happened.

Not Setting ESP SMTP time
Message-ID: [email protected]
Date: Thu, 05 Sep 2024 03:58:20 -0700 (PDT)

[jeff7gio]

I don't understand why the 2822 date doesn't get picked up. The text from this Set_Time.ino line shows the correct time stamp, which I assume suggests the setSystemTime function is working:
message.text.content = "This is simple plain text message\n\nSent #esp_mail_current_time";

Output from code

RTC Current time
2024-09-05T13:35:00
MailClient.Time.getDateTimeString()
Sun, 00 Jan 1900 00:00:00 -0-500

RTC.begin();

 RTCTime startTime(5, Month::SEPTEMBER, 2024, 13, 35, 00, DayOfWeek::THURSDAY, SaveLight::SAVING_TIME_ACTIVE);
 RTC.setTime(startTime);

RTCTime currentTime;

// Get current time from RTC
RTC.getTime(currentTime);
Serial.println("\n\nRTC Current time");
Serial.println(currentTime.toString());

float gmtOffset = -5.0; // GMT offset in hour
smtp.setSystemTime(currentTime.getUnixTime(), gmtOffset);

Serial.println("MailClient.Time.getDateTimeString()");
Serial.println(MailClient.Time.getDateTimeString());