Usage#
After startup the application shows 4 empty input fields. Below the timezone selectbox you will see which timeformat for the input of local time and/or UTC is expected (Isodatetime-format).

The application needs exactly to inputs for converting a timestamp into UTC and localtime or localtime or UTC into an unixt timestamp.
Select first a timezone (first rectangle on the screenshot) of your choice and then fill in into one of the 3 fields for time (lower rectangle). Click on the button right of the timefield where you filled in your time.
All 3 fields will be calculated and filled out.
With a click on the reset button all 3 fields for time will be cleared.
Basically a click on “Reset” is not needed if you need another time calculated refill the field of your choice and click on the button right of it. All 3 timefields will be recalculated.
Hints:
Be aware, that the field for Unixtime accept only numbers from 0 - 9 and a max value of 99999999999 (which is date and time 5138-11-16 09:46:39 UTC!). After this date somebody else has to take care. The minimum time for this field is 1.
The entryfields for local time and UTC accepting only numbers and characters for the combined ISO datetime-format. For more information of this format see https://de.wikipedia.org/wiki/ISO_8601
No milliseconds are used in timefields!