# Dates, times and time zones

Prompt · Correctness and reliability · R04

Finds the date bugs that show up twice a year, at midnight, or in another time zone.

## Prompt

```text
Analyze the system's handling of time: time zones, daylight saving, expiration, scheduled jobs, clock differences, and historical as-of queries.
```

**What it returns:** Each time-sensitive path with the zone it assumes, and a test at a DST boundary and at midnight in Memphis and UTC.

**Skip it when:** Features that never show or compare dates.

**Tools:** Repository; tests with the clock fixed to a set time.

**Changes:** Adds a test that shows it

**Sessions:** One session

## Related

- [Old records, new meanings](https://www.atlasscope.dev/prompts/old-records-new-meanings): Finds old records that read differently once today's rules are applied to them.

Source: https://www.atlasscope.dev/prompts/dates-times-and-time-zones