The man page is what I used; granted, it required a little experimentation before I figured it out. And, if I don't use it for six month or a year, I forget everything and have to start over, and learn it again.
At has two types of time specifications.
If you use "-t <timespec>", the "timespec" is a single format, starting with an optional century, then optional year, then month, then day, then hour, then minute, then optional seconds:
e.g: 200905012315.30 = this coming May 1, at 23:15:30. 05012316 = the same evening, 30 seconds later, at 23:16:00
The other formats that do not use -t are much more loosely defined.
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