Frantisek Sumsal ed4a5b4345 time-util: introduce TIMESTAMP_UNIX
Allow formatting timestamps as number of seconds since the Epoch for easier
machine parsing.

Fixes: #22567

```
$ systemctl show systemd-journald | grep Timestamp
WatchdogTimestampMonotonic=0
ExecMainStartTimestamp=Sat 2021-12-11 15:25:57 CET
ExecMainStartTimestampMonotonic=13030408
ExecMainExitTimestampMonotonic=0
StateChangeTimestamp=Sat 2021-12-11 15:25:57 CET
StateChangeTimestampMonotonic=13049273
InactiveExitTimestamp=Sat 2021-12-11 15:25:57 CET
InactiveExitTimestampMonotonic=13030430
ActiveEnterTimestamp=Sat 2021-12-11 15:25:57 CET
ActiveEnterTimestampMonotonic=13049273
ActiveExitTimestamp=Sat 2021-12-11 15:25:57 CET
ActiveExitTimestampMonotonic=12997236
InactiveEnterTimestamp=Sat 2021-12-11 15:25:57 CET
InactiveEnterTimestampMonotonic=13028890
ConditionTimestamp=Sat 2021-12-11 15:25:57 CET
ConditionTimestampMonotonic=13029539
AssertTimestamp=Sat 2021-12-11 15:25:57 CET
AssertTimestampMonotonic=13029540

$ systemctl show --timestamp=unix systemd-journald | grep Timestamp
WatchdogTimestampMonotonic=0
ExecMainStartTimestamp=@1639232757
ExecMainStartTimestampMonotonic=13030408
ExecMainExitTimestampMonotonic=0
StateChangeTimestamp=@1639232757
StateChangeTimestampMonotonic=13049273
InactiveExitTimestamp=@1639232757
InactiveExitTimestampMonotonic=13030430
ActiveEnterTimestamp=@1639232757
ActiveEnterTimestampMonotonic=13049273
ActiveExitTimestamp=@1639232757
ActiveExitTimestampMonotonic=12997236
InactiveEnterTimestamp=@1639232757
InactiveEnterTimestampMonotonic=13028890
ConditionTimestamp=@1639232757
ConditionTimestampMonotonic=13029539
AssertTimestamp=@1639232757
AssertTimestampMonotonic=13029540
```
2022-02-21 13:21:58 +01:00
2022-02-21 13:21:58 +01:00
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2022-02-16 13:30:20 +01:00

Systemd

System and Service Manager

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