It's also not too complicated to add a few lines of javascript that show the datet/time in the user's local time zone (via Date.getTimezoneOffset) as well.
GCP's various products have gotten a lot better at this lately, but just a few months ago I could click around between various dashboards and explorers, some showing the time in UTC, some in your browser's tz, and some in your profile's tz (if I recall correctly). Some of them were showing the tz, and for some you had to guess. Sometimes you had multiple tzs on the same page. Sometimes the date picker for a control was in one tz and the widget it was controlling in another (leading to quite a lot of confusion).
The worst offence IMO was not showing the tz at all. Especially given the overall lack of consistency.
We do this in all of our web apps. It's pretty simple and dramatically improves UX when you have customers that are doing a lot of scheduling.
Showing both at the same time is peak design for me personally. UTC compares for relative sequencing, local time for "was that before or after I ate lunch".
still show the timezone it's displayed in, users aren't always fully aware of which time zone their browser is believing they are in (sounds stupid at first but imagine you just traveled somewhere and are temporary used to that time zone but e.g. your laptop is fixed set to your home time zone, or maybe it's not and you just thought it is, or maybe you are just a bit confused because you switched time zones 4 times the last 24 hours etc.)
GCP's various products have gotten a lot better at this lately, but just a few months ago I could click around between various dashboards and explorers, some showing the time in UTC, some in your browser's tz, and some in your profile's tz (if I recall correctly). Some of them were showing the tz, and for some you had to guess. Sometimes you had multiple tzs on the same page. Sometimes the date picker for a control was in one tz and the widget it was controlling in another (leading to quite a lot of confusion).
The worst offence IMO was not showing the tz at all. Especially given the overall lack of consistency.