Time App is a simple and elegant app for displaying time with seconds.
Free, no ads, no permissions!
In addition, the time since an event (e.g. married for 10 years, 4 months 3 days...)
or the time until an event (e.g. time until vacation, Christmas, birthday, New Year's Eve)
displayed.

Calculates the time from or to a previously defined date:
Long-term countdown (e.g. years months days hours minutes seconds until my 18th birthday)
Long-term countup (e.g. how long have we been married)

Clock, time, seconds, second hand