BUG #17573: timestamptz casting precision goes down as the year goes up - Mailing list pgsql-bugs
| From | PG Bug reporting form |
|---|---|
| Subject | BUG #17573: timestamptz casting precision goes down as the year goes up |
| Date | |
| Msg-id | 17573-816a53478f1c08e2@postgresql.org Whole thread Raw |
| Responses |
Re: BUG #17573: timestamptz casting precision goes down as the year goes up
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| List | pgsql-bugs |
The following bug has been logged on the website: Bug reference: 17573 Logged by: Luc Lavoie Email address: luc.lavoie@usherbrooke.ca PostgreSQL version: 14.4 Operating system: macOS 12.5 Description: timestamptz casting on year 2022 values returns a precision of one microsecond (as it is expected). As the year goes up, the precision goes down as the script below will show for years 2022, 23621, 2713, 4022, and 8022. select 'Exact p = 1 microsecond' as "message", to_timestamp (extract (epoch from timestamptz '2022-08-01 00:00:00.000000 +00:00')) as "2022-08-01 00:00:00.000000", to_timestamp (extract (epoch from timestamptz '2022-08-01 00:00:00.000001 +00:00')) as "2022-08-01 00:00:00.000001", to_timestamp (extract (epoch from timestamptz '2022-08-01 00:00:00.000002 +00:00')) as "2022-08-01 00:00:00.000002", to_timestamp (extract (epoch from timestamptz '2022-08-01 00:00:00.000003 +00:00')) as "2022-08-01 00:00:00.000003" ; select 'Error p ~ 2 microseconds' as "message", to_timestamp (extract (epoch from timestamptz '2361-08-01 00:00:00.000000 +00:00')) as "2361-08-01 00:00:00.000000", to_timestamp (extract (epoch from timestamptz '2361-08-01 00:00:00.000001 +00:00')) as "2361-08-01 00:00:00.000001", to_timestamp (extract (epoch from timestamptz '2361-08-01 00:00:00.000002 +00:00')) as "2361-08-01 00:00:00.000002", to_timestamp (extract (epoch from timestamptz '2361-08-01 00:00:00.000003 +00:00')) as "2361-08-01 00:00:00.000003"; select 'Error p ~ 4 microseconds' as "message", to_timestamp (extract (epoch from timestamptz '2713-08-01 00:00:00.000000 +00:00')) as "2713-08-01 00:00:00.000000", to_timestamp (extract (epoch from timestamptz '2713-08-01 00:00:00.000001 +00:00')) as "2713-08-01 00:00:00.000001", to_timestamp (extract (epoch from timestamptz '2713-08-01 00:00:00.000002 +00:00')) as "2713-08-01 00:00:00.000002", to_timestamp (extract (epoch from timestamptz '2713-08-01 00:00:00.000003 +00:00')) as "2713-08-01 00:00:00.000003"; select 'Error p ~ 8 microseconds' as "message", to_timestamp (extract (epoch from timestamptz '4022-08-01 00:00:00.000000 +00:00')) as "4022-08-01 00:00:00.000000", to_timestamp (extract (epoch from timestamptz '4022-08-01 00:00:00.000010 +00:00')) as "4022-08-01 00:00:00.000010", to_timestamp (extract (epoch from timestamptz '4022-08-01 00:00:00.000020 +00:00')) as "4022-08-01 00:00:00.000020", to_timestamp (extract (epoch from timestamptz '4022-08-01 00:00:00.000030 +00:00')) as "4022-08-01 00:00:00.000030"; select 'Error p ~ 32 microseconds' as "message", to_timestamp (extract (epoch from timestamptz '8022-08-01 00:00:00.000000')) as "8022-08-01 00:00:00.000000", to_timestamp (extract (epoch from timestamptz '8022-08-01 00:00:00.000010')) as "8022-08-01 00:00:00.000010", to_timestamp (extract (epoch from timestamptz '8022-08-01 00:00:00.000020')) as "8022-08-01 00:00:00.000020", to_timestamp (extract (epoch from timestamptz '8022-08-01 00:00:00.000030')) as "8022-08-01 00:00:00.000030"; Results obtained +-----------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |message |2022-08-01 00:00:00.000000 |2022-08-01 00:00:00.000001 |2022-08-01 00:00:00.000002 |2022-08-01 00:00:00.000003 | +-----------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |Exact p = 1 microsecond|2022-08-01 00:00:00.000000 +00:00|2022-08-01 00:00:00.000001 +00:00|2022-08-01 00:00:00.000002 +00:00|2022-08-01 00:00:00.000003 +00:00| +-----------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ +------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |message |2361-08-01 00:00:00.000000 |2361-08-01 00:00:00.000001 |2361-08-01 00:00:00.000002 |2361-08-01 00:00:00.000003 | +------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |Error p ~ 2 microseconds|2361-08-01 00:00:00.000000 +00:00|2361-08-01 00:00:00.000002 +00:00|2361-08-01 00:00:00.000002 +00:00|2361-08-01 00:00:00.000004 +00:00| +------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ +------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |message |2713-08-01 00:00:00.000000 |2713-08-01 00:00:00.000001 |2713-08-01 00:00:00.000002 |2713-08-01 00:00:00.000003 | +------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |Error p ~ 4 microseconds|2713-08-01 00:00:00.000000 +00:00|2713-08-01 00:00:00.000000 +00:00|2713-08-01 00:00:00.000004 +00:00|2713-08-01 00:00:00.000004 +00:00| +------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ +-------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |message |4022-08-01 00:00:00.000000 |4022-08-01 00:00:00.000010 |4022-08-01 00:00:00.000020 |4022-08-01 00:00:00.000030 | +-------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |Error p ~ 8 microseconds|4022-08-01 00:00:00.000000 +00:00|4022-08-01 00:00:00.000008 +00:00|4022-08-01 00:00:00.000024 +00:00|4022-08-01 00:00:00.000032 +00:00| +-------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ +-------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |message |8022-08-01 00:00:00.000000 |8022-08-01 00:00:00.000010 |8022-08-01 00:00:00.000020 |8022-08-01 00:00:00.000030 | +-------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+ |Error p ~ 32 microseconds|8022-08-01 00:00:00.000000 +00:00|8022-08-01 00:00:00.000000 +00:00|8022-08-01 00:00:00.000032 +00:00|8022-08-01 00:00:00.000032 +00:00| +-------------------------+---------------------------------+---------------------------------+---------------------------------+---------------------------------+
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