Time & Date Tools

Working with Time & Date Tools

Time bugs rarely come from adding two numbers; they come from time zones, daylight-saving changes, ambiguous formats, and assumptions about what a timestamp represents. These tools help parse, convert, normalize, and inspect dates, durations, IDs with embedded timestamps, and common machine-readable time formats.

Keep an instant in time separate from its display format. Unix timestamps are typically UTC-based, while a calendar date such as “2026-03-10 09:00” is incomplete until a time zone is known. When scheduling or comparing events, preserve the original zone and offset where possible, and test dates around daylight-saving transitions if the application serves regions that use them.

Practical tips

• Store machine timestamps in a consistent standard such as UTC, then convert for display at the edge.
• Do not infer a time zone from a numeric offset alone; offsets can change seasonally.
• Use ISO 8601 with an explicit offset or `Z` when exchanging timestamps between systems.
• When parsing durations, distinguish calendar months or years from fixed numbers of seconds.
• Test boundary cases around midnight, leap years, month ends, and daylight-saving transitions.