I had to look up that last bit. There was a system I was working with whose developers told me “Assume Eastern Time” all the time (I'm on PDT/PST)…until the daylight saving time change in March. I missed some data from their end and their developers told me to “just fetch again and correct your code”
> While it may be safe to assume local time when communicating in the same time zone, it is ambiguous when used in communicating across different time zones.
> While it may be safe to assume local time when communicating in the same time zone, it is ambiguous when used in communicating across different time zones.
https://en.wikipedia.org/wiki/ISO_8601#Time_zone_designators