java timestamp with timezone

### key classes

1. **instant**: represents a specific moment in time (timestamp) in utc.
2. **zoneddatetime**: represents a date-time with a time zone (e.g., `2023-10-01t10:15:30+01:00[europe/paris]`).
3. **offsetdatetime**: represents a date-time with an offset from utc (e.g., `2023-10-01t10:15:30+01:00`).

### working with timestamps and time zones

here's a step-by-step tutorial on how to work with timestamps and time zones in java.

#### step 1: getting the current timestamp

you can obtain the current timestamp in utc using the `instant` class:

#### step 2: converting instant to zoneddatetime

to convert the `instant` to a `zoneddatetime` in a specific time zone:

#### step 3: formatting zoneddatetime

to format the `zoneddatetime` to a human-readable string, you can use the `datetimeformatter` class:

#### step 4: converting between time zones

if you want to convert a `zoneddatetime` from one time zone to another:

### summary

1. **instant** captures the current moment in time in utc.
2. **zoneddatetime** represents date-time with a specific time zone.
3. **offsetdatetime** can represent date-time with a fixed offset from utc.
4. use `datetimeformatter` to format date-time objects.

### complete example

here’s the complete code that demonstrates all the steps:

### conclusion

...

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