You should be able to edit a scheduled message.
You can edit scheduled messages on Android and iOS, but not in TDesktop.
Version of Telegram Desktop: 1.8.4 Stable 2.1.0 Stable
Still revelant on 1.8.6 beta.
Using Telegram 1.8.4, it could not be reproduced in MacOS 10.14.6. However, I was able to reproduce the bug in Win10, version 1903.
Still in TDesktop 1.8.8 on Win10, version 1903
On 2.1 and earlier versions if I change posting time from iOS app it wont update on desktop until restart
This is still a problem!
Still miss!
Still missing. 2.1.17 beta.
Most helpful comment
https://github.com/telegramdesktop/tdesktop/commit/5c097887efb2f2182014d765e05680372c82eb9c
https://github.com/telegramdesktop/tdesktop/commit/0a4f3f310c32cbdfe25859e1bc9d97f8cd81a5a1