Graph/894cd39e-9bc2-4c35-841b-b839d15ec220

Domainunvalidated

Time Zones

894cd39e-9bc2-4c35-841b-b839d15ec220

Time Zones

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Updated5/1/2026

PageRank0.0001

Effectiveness0.000

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27 linked nodes

RELATES_TORootCause

timestamptz + interval depends on the current TimeZone setting and daylight-savings adjustments

RELATES_TOProblem

Creating OffsetDateTime from LocalDateTime at Europe/Paris is ambiguous during the DST overlap

PERTAIN_TORootCause

timestamptz + interval depends on the current TimeZone setting and daylight-savings adjustments

PERTAIN_TOProblem

the actual return result was `2025-02-12T06:30:04-05:00` — For timestamp with timezone, the internally stored value is always in UTC. Tension: which represents a timestamp in US/Eastern rather than UTC. Outcome: Only the display differs.

PERTAIN_TOSolution

If you prefer `timestamptz` values to be displayed for the UTC timezone — Postgres displays `timestamptz` values according to the `timezone` setting of the session. Tension: Of course, Postgres will then assume UTC where no time zone is given explicitly. Outcome: SET timezone = 'UTC';.

PERTAIN_TOSolution

time zone abbreviations like `'EST'` are a crude tool — to be smart about daylight saving time (and other political changes across history). Tension: only encode a constant time offset. Outcome: use a time zone name, like `'US/Eastern'`.

PERTAIN_TOProblem

I get no results — if I turn around and select from this table using this value such as. Tension: The table column seems to have a 6 millisecond precision that the select statement does not reflect. Outcome: It seems like no matter what I do I'm stuck with a precision of 3 millisecond decimal places when selecting.

PERTAIN_TOProblem

I have a table holding the daily balances of each account, but only on days on which there has been a transaction on the account. — I have a table holding the daily balances of each account. Tension: I have no entries on.

PERTAIN_TOSolution

The index cannot be used. — CREATE INDEX my_balance_table_multi_idx ON my_balance_table (account_id, updated_at DESC, balance);. Tension: Your query filters on the expression `updated_at::DATE`, applied to the table column. Outcome: CREATE INDEX my_balance_table_multi_idx ON my_balance_table (account_id, updated_at DESC) INCLUDE (balance);.

PERTAIN_TOProblem

How do I check if the timestamp is not between (start_hour1 and end_hour1) and (start_hour2 and end_hour2). — I have a table look like below. Tension: start_hour2 and end_hour2 could be null as well.

PERTAIN_TOSolution

start_hour2 and end_hour2 could be null as well. Tension: How do I check if the timestamp is not between (start_hour1 and end_hour1) and (start_hour2 and end_hour2). Outcome: or just pure and simple `BETWEEN`.

PERTAIN_TOProblem

this record is inserted with the date and time from my local host and not from the database server — inserting a new record into my PostgreSQL database. Tension: The time on this server is different than on my localhost.

PERTAIN_TORootCause

The time is always 19:00:00. — inside the Java code of my API. Outcome: Check your server's timezone. Also, it could be from the formatting you're doing at the backend.

PERTAIN_TOProblem

once I attempt to use the datepicker. Outcome: when I call to the date value to display it inside the app, it is returning a date value of `2025-03-31T00:00:00.000+00:00`.

PERTAIN_TOSolution

Check your server's timezone. — the formatting you're doing at the backend. Tension: it could be from the formatting you're doing at the backend. Outcome: make sure it's not formatting based on a specific time and timezone.

PERTAIN_TOSolution

LocalTime inMillis = time.truncatedTo(ChronoUnit.MILLIS); — LocalTime time = LocalTime.now();. Tension: you want something briefer. Outcome: LocalTime inTenths = inMillis.with(ChronoField.MILLI_OF_SECOND, inMillis.get(ChronoField.MILLI_OF_SECOND) / 100 * 100);.

PERTAIN_TOProblem

Unable to parse the date: 2025-03-09T02:37:51.742. Tension: All the dates are working before and after that one hour.

PERTAIN_TOSolution

parse as a `LocalDateTime`. — Your string input represents a date with time of day, but lacks the context of a time zone or offset from UTC. Tension: Without a zone or offset, we have no way of knowing if this is 2 AM in Tokyo Japan, 2 AM in Toulouse France, or 2 AM in Toledo Ohio US. Outcome: If you are certain your input was meant to represent a moment as seen in a particular time zone, specify that zone to generate a `ZonedDateTime`.

PERTAIN_TOProblem

Creating OffsetDateTime from LocalDateTime at Europe/Paris is ambiguous during the DST overlap

PERTAIN_TOSolution

Use ZonedDateTime.ofLocal() and specify the preferred offset when a local date-time falls in an overlap

PERTAIN_TORootCause

LocalTime comparisons ignore date rollover and time zone handling, so the next Azan moment is computed incorrectly

PERTAIN_TOProblem

TimerTask does not run at the desired times

PERTAIN_TOSolution

Use ScheduledExecutorService with ZonedDateTime and Duration to schedule the next execution

PERTAIN_TOProblem

I need to retrieve some data from the db and I need to check if the given date matches the one in the table — I am converting the `String` I get from the front end app, transform it in a `java.util.Date` and then in a `LocalDateTime`. Tension: Is this approach correct, or am i missing something? Outcome: Format of the string from the front end and also stored in db: 2025-01-29 15:09:57.475000.

PERTAIN_TORootCause

the same abbreviation is often used for multiple time zones — For compatibility with JDK 1.1.x. Tension: the Java platform can then only recognize one of them. Outcome: their use is deprecated.

PERTAIN_TOProblem

a time zone abbreviation such as `PST` — whether the user is in the Philippines, US, Canada, etc. Tension: both provide an exhaustive list and don't give any guidance on which to pick. Outcome: a lot closer than having to guess when we get an ambiguous time zone as input.

PERTAIN_TOSolution

you need to use `ZoneId.of(String, Map)` method — To be able to use the ambiguous short IDs. Tension: the map provides the mapping between unsupported names and a supported name. Outcome: you'll need to provide said mapping yourself with a custom `Map`.

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