WhatsApp has been upgraded and made a small change in its interface, many of which are overlooked. With version 2.18.361, it is now available for Android and IOS devices, it is believed that the public has greater awareness of the timing of messages being sent and to improve the quality of communication they need with another.
Instant Messaging decided to change the way the chart is presented. You will no longer use a.m. and q to start using "7.20", "04 hours" and "21:00".
Another change that was introduced was that WhatsApp would become obsolete with an old software system. Mobile phones that can not resist the application will be managed within the Nokia S40 system.
By 2020, will not work on devices running iOS 7 or an older system Apple or those who have version 2.3.7 or earlier on Android.
If you do not see this change in your message schedules, you will need to update the version of the application.