Timestamp Validator & Formatter
Check if a number is a valid timestamp and then format it beautifully. This tool validates the range and lets you choose from dozens of output formats.
Timestamp Validator & Formatter
Validate and format Unix timestamps
How it works
Enter any timestamp value in the input field. The validator checks if it's a valid Unix timestamp (seconds or milliseconds), ISO 8601 date, RFC 2822 date, or other common timestamp formats.
Invalid timestamps are flagged with specific error messages indicating what went wrong - out of range, malformed, impossible date, or unrecognized format. Valid timestamps are parsed and displayed in multiple formats.
The formatter normalizes valid timestamps to your preferred output format. Clean up inconsistent timestamp data by pasting multiple values and getting standardized output. Copy results with a single click.
When You'd Actually Use This
Data Validation
Verify timestamp data before importing into databases or processing systems.
API Input Validation
Validate user-submitted timestamps in forms and API requests before processing.
Data Cleaning
Identify and fix malformed timestamps in datasets before analysis.
Log Parsing
Validate and normalize timestamps extracted from various log formats.
Testing
Generate valid and invalid timestamps for test cases and edge case validation.
Documentation
Verify timestamp examples in documentation are valid and correctly formatted.
What to Know Before Using
Valid ranges: Unix seconds typically range from 0 (1970) to 2038+ (varies by system). Milliseconds are 1000x larger.
Format detection: The validator tries multiple formats. ISO 8601, RFC 2822, Unix timestamps, and common date strings are recognized.
Common errors: Invalid month (13), invalid day (32), impossible dates (Feb 30), malformed strings, out-of-range values.
Timezone handling: Timestamps with timezone are validated in that timezone. Without timezone, local time is assumed.
Batch validation: Paste multiple timestamps (one per line) to validate and format many values at once.
Common Questions
What makes a valid timestamp?
Valid timestamps represent real moments in time. They must be properly formatted and within reasonable ranges (not year 99999).
How do I validate ISO 8601?
Enter the ISO 8601 string. The validator checks format, valid date components, and timezone. Invalid strings show specific errors.
What is an invalid timestamp?
Invalid timestamps include: non-numeric values, impossible dates (Feb 30), out-of-range values, or malformed format strings.
Can I validate multiple timestamps?
Yes. Paste multiple timestamps (one per line) and each will be validated independently with individual results.
What formats are supported?
Unix seconds/milliseconds, ISO 8601, RFC 2822, common date strings (YYYY-MM-DD, MM/DD/YYYY), and more.
How do I fix invalid timestamps?
The error message indicates what's wrong. Fix the specific issue - correct typos, use valid dates, or reformat to recognized pattern.
Can I normalize timestamp formats?
Yes. Valid timestamps are reformatted to your selected output format, normalizing inconsistent input data.
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