Learn Timestamps

Getting Started with Timestamps

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What is a Timestamp?

A timestamp is a sequence of characters or encoded information identifying when a certain event occurred.

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Common Timestamp Formats

Unix Timestamp (Seconds):

Number of seconds since January 1, 1970 (Unix epoch)

Example: 1704067200 (January 1, 2024 00:00:00 UTC)

Unix Timestamp (Milliseconds):

Number of milliseconds since Unix epoch

Example: 1704067200000

ISO 8601:

Human-readable format

Example: 2024-01-01T00:00:00Z

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Unix Epoch

The Unix epoch is January 1, 1970, 00:00:00 UTC. This is the reference point for Unix timestamps.

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Time Zones

UTC (Coordinated Universal Time) - The reference time

Local time - Your specific time zone

Always store timestamps in UTC, convert to local time for display

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JavaScript Example

``javascript // Get current timestamp in milliseconds const timestamp = Date.now();

// Convert to date object const date = new Date(timestamp);

// Format as ISO string const isoString = date.toISOString();

// Parse ISO string const parsedDate = new Date('2024-01-01T00:00:00Z'); ``

Advanced Timestamp Concepts

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Timestamp Precision

Seconds: Precision to the second (good for most applications)

Milliseconds: Precision to the millisecond (good for high-resolution timing)

Microseconds: Precision to the microsecond (used in scientific applications)

Nanoseconds: Precision to the nanosecond (used in specialized systems)

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Time Zone Handling

Best Practices:

1. Store timestamps in UTC 2. Convert to local time only for display 3. Use ISO 8601 format for string representation 4. Be aware of daylight saving time changes

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Formatting Options

RFC 2822:

Example: Wed, 01 Jan 2024 00:00:00 GMT

Custom Formats:

YYYY-MM-DD HH:mm:ss

DD/MM/YYYY

MM/DD/YYYY HH:mm

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Database Considerations

Use appropriate data types (DATETIME, TIMESTAMP)

Understand time zone handling in your database

Consider storing UTC timestamps

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Conversion Tools

JavaScript: Date object, Intl.DateTimeFormat

Python: datetime module, arrow library

Java: java.time package

SQL: CONVERT, CAST functions