While textfx already does have that feature, it only have the timezone of using the system's time, and the format is:

3:58 PM 4/28/2020

Or

3:58 PM Tuesday, April 28, 2020

However, it lacks these features:

• Which timezone, for example UTC
• 12/24-hour format (1:00pm is 13:00)
• Which format, like have it in descending units order: YYYY-MM-DD HH:MM:SS
• If you want or don't want the day names to be shown
• If you want the month to be displayed as numbers instead of names (so instead of [jan 1, 2020], will display [01/01/2020])
• Display seconds