Timestamp <--  --> Epoch Milliseconds, Can support local TimeZone? not only ISO...

**Is your feature request related to a problem? Please describe.**
Timestamp <--  --> Epoch Milliseconds, Can support local TimeZone? not only ISO...

**Describe the solution you'd like**
add two menus.
local TimeZone Timestamp to Epoch Milliseconds
Epoch Milliseconds to local TimeZone Timestamp

**Describe alternatives you've considered**
none

**Additional context**
none