Timestamp Converter
Convert Unix timestamps to dates and back.
Unix Timestamp
Date & Time
Conversion Results
From Timestamp
From Date/Time
Common Timestamps
About Timestamp Conversion
Unix timestamp: Seconds since January 1, 1970 (Unix epoch) in UTC.
Timezone support: Convert between different timezones and UTC.
Multiple formats: ISO 8601, RFC 2822, and relative time formats.
Precision: Support for seconds and milliseconds.
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Learn more — open a section when you need details
The Timestamp Converter is a comprehensive date and time conversion tool that translates between Unix timestamps (seconds since 1970-01-01 UTC epoch or milliseconds for extended precision) and human-readable date/time formats across multiple timezones. It displays canonical date/time formats including UTC (Coordinated Universal Time), Local time (browser timezone), ISO 8601 standard format (YYYY-MM-DDTHH:mm:ssZ), RFC 2822 format, and relative time descriptions (e.g., "2 hours ago", "in 3 days"). The tool provides quick timestamp presets for common reference points (current time/now, start of day, start of week, start of month, start of year, Unix epoch) and handles both second-based (10-digit) and millisecond-based (13-digit) Unix timestamps automatically. It processes all conversions entirely locally in your browser, ensuring privacy and fast performance without server uploads. Use it to debug API payloads containing timestamp data, verify scheduling configurations and cron jobs, sanity-check log file timestamps, normalize mixed timestamp formats in data migrations, avoid off-by-timezone mistakes in time calculations, or any scenario requiring accurate timestamp-to-date conversion and timezone handling for development, debugging, and data processing workflows.
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Enter a Unix timestamp in seconds (10 digits, e.g., 1609459200) or milliseconds (13 digits, e.g., 1609459200000) into the timestamp input field, and click "Convert" to transform the timestamp into human-readable date/time formats, as the tool automatically detects whether input is seconds or milliseconds based on digit count.
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Alternatively, pick a Date using date picker, select Time using time selector, and choose Timezone from timezone dropdown to generate a Unix timestamp from human-readable date/time input, enabling bidirectional conversion between timestamps and date/time formats for flexible timestamp generation and conversion.
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Review all output formats displayed in results panel including UTC time (Coordinated Universal Time), Local time (your browser timezone), ISO 8601 format (standardized international format), RFC 2822 format (email-style format), and relative time description (human-readable relative time like "2 hours ago") for comprehensive timestamp interpretation.
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Use "Common Timestamps" quick picks if available to select frequently used timestamp references: "Now" for current timestamp, "Start of Day" for today at midnight, "Start of Week" for week beginning, "Start of Month" for month beginning, "Start of Year" for year beginning, or "Epoch" for Unix epoch (January 1, 1970) enabling quick timestamp access for common reference points.
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Copy timestamp values or formatted date strings to clipboard using "Copy" buttons for immediate use in code, cron job configurations, API requests, database queries, or documentation, enabling efficient timestamp usage in development, system configuration, or data processing workflows requiring timestamp integration.
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Verify timestamp format (seconds vs milliseconds) by checking digit count or tool auto-detection, as timestamps with 13 digits are milliseconds (multiply by 1000 to get seconds), while 10 digits are seconds, requiring format verification to ensure correct timestamp interpretation and avoid 1000x conversion errors.
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Compare UTC and Local time outputs to understand timezone differences and daylight saving time (DST) effects, as timezone offsets and DST transitions affect local time representation, requiring timezone awareness for accurate timestamp interpretation and scheduling across different timezones.
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Export or save timestamp conversions for documentation, debugging records, or reference purposes if export features are available, as timestamp conversion records enable debugging documentation, timestamp reference tracking, or timestamp conversion history for development and troubleshooting workflows requiring persistent timestamp conversion records.
API debugging and payload inspection
Verify JWT token expiration (exp) and issued-at (iat) timestamps, inspect webhook payload timestamps, or analyze signed URL expiration timestamps for API debugging, enabling accurate timestamp interpretation and verification for API development, webhook debugging, and authentication token analysis requiring timestamp validation.
Scheduling and timezone conversion
Convert meeting times, release windows, or scheduled events across different timezones, enabling accurate scheduling and timezone coordination for global teams, distributed systems, or multi-timezone operations requiring timezone-aware scheduling and event coordination across geographic regions.
Log analysis and debugging
Map event timestamps from log files (often in milliseconds or seconds) to readable date/time formats for log analysis, enabling efficient log debugging and event timeline reconstruction through readable timestamp conversion for system administration, debugging, and log file analysis workflows.
Data migration and timestamp normalization
Normalize mixed timestamp formats (some in seconds, some in milliseconds) during data migration, enabling consistent timestamp format standardization across databases, systems, or data sources requiring timestamp format unification and normalization for data migration and system integration workflows.
Database and system administration
Convert database timestamp fields, system log timestamps, or application timestamps for system administration tasks, enabling timestamp interpretation and conversion for database queries, system monitoring, or administrative workflows requiring accurate timestamp handling in system administration.
Development and testing workflows
Generate test timestamps, verify timestamp calculations in code, or test timezone handling in applications during development and testing, enabling timestamp testing and validation for application development requiring accurate timestamp generation and conversion for testing and development workflows.
Compliance and audit trail documentation
Convert timestamps for compliance reports, audit trails, or documentation requiring human-readable timestamps, enabling timestamp conversion for regulatory compliance, audit documentation, or legal documentation requiring readable timestamp formats for compliance and audit workflows.
Time-based calculations and analysis
Perform time-based calculations, analyze time intervals, or compare timestamps for temporal analysis, enabling timestamp-based time calculations and interval analysis for data analysis, performance measurement, or time-based metric evaluation requiring accurate timestamp conversion and time calculations.
Recognize that timestamps greater than 1e10 (10,000,000,000) are likely milliseconds; the tool typically auto-detects this, as millisecond timestamps (13 digits) are much larger than second timestamps (10 digits), requiring format awareness to avoid 1000x conversion errors when working with different timestamp precisions.
Always store timestamps in UTC format in systems and databases; convert to local time only for display purposes, as UTC storage eliminates timezone confusion, DST issues, and ensures consistent timestamp handling across different user locations requiring UTC-first storage strategy for reliable timestamp management.
Use ISO 8601 format (YYYY-MM-DDTHH:mm:ssZ) in APIs and data exchange for portability and clarity, as ISO 8601 is international standard format that works across all systems, locales, and timezones, requiring ISO 8601 usage for API design and data exchange requiring universal timestamp format compatibility.
Beware daylight saving time (DST) shifts when comparing Local vs UTC times, as DST transitions cause timezone offsets to change (spring forward, fall back), creating 1-hour discrepancies during DST transitions requiring DST awareness when converting between local and UTC times during DST transition periods.
Prefer 64-bit timestamps to avoid Year 2038 problem (32-bit integer overflow), as 64-bit timestamps extend beyond 2038 without overflow issues, while 32-bit timestamps fail after January 19, 2038, requiring 64-bit timestamp usage for long-term system compatibility and avoiding Year 2038 timestamp limitations.
Verify timestamp format (seconds vs milliseconds) before using in calculations, as format confusion causes 1000x errors, requiring format verification (10 digits = seconds, 13 digits = milliseconds) and proper format handling to ensure accurate timestamp usage and prevent magnitude errors in timestamp calculations.
Test timestamp conversions with known reference points (Unix epoch, current time) to validate accuracy, as reference point validation catches conversion errors and ensures timestamp handling is correct, requiring spot-checking conversions against well-known timestamps to verify converter accuracy and reliability.
Document timezone assumptions when sharing timestamps or scheduling, as timezone information is critical for accurate timestamp interpretation, requiring timezone documentation and clear timezone indication when sharing timestamps or scheduling events across different geographic locations requiring timezone-aware communication.
Treating millisecond timestamps as second timestamps causing 1000× conversion errors, when Unix timestamps in milliseconds (13 digits, e.g., 1609459200000) are used as if they were seconds (10 digits, e.g., 1609459200), causing 1000× time errors (timestamps off by approximately 16.67 minutes per 1 million milliseconds) requiring recognizing timestamp format (milliseconds = 13 digits, seconds = 10 digits) and using correct conversion method matching timestamp format to avoid significant time calculation errors.
Assuming Local time equals UTC time ignoring timezone offsets and daylight saving time causing time errors, when local timezone timestamps are treated as UTC without accounting for timezone offsets or daylight saving time (DST), causing time discrepancies (hours off depending on timezone), incorrect date/time interpretation, or scheduling errors requiring accounting for timezone offsets and DST when converting between Local and UTC, understanding that local time differs from UTC by timezone offset (may change with DST transitions).
Comparing date/time strings across different locales without ISO 8601 formatting causing comparison errors, when date/time strings in different formats or locales are compared directly without standardized formatting, causing incorrect comparisons, sorting errors, or timezone confusion requiring using ISO 8601 format (YYYY-MM-DDTHH:mm:ssZ) for cross-locale date/time comparisons and ensuring consistent formatting for accurate date/time operations across different systems and locales.
Forgetting Z suffix when intending UTC time in ISO 8601 format causing timezone ambiguity, when ISO 8601 formatted dates are created without Z suffix (UTC indicator) but represent UTC time, causing timezone ambiguity, potential timezone misinterpretation, or incorrect time conversions requiring including Z suffix for UTC times in ISO 8601 (e.g., 2024-01-01T00:00:00Z) to clearly indicate UTC and prevent timezone confusion in ISO-formatted timestamps.
Using 32-bit Unix timestamps expecting them to work beyond 2038 causing Year 2038 problem, when 32-bit Unix timestamps are used in systems or calculations expecting them to work beyond January 19, 2038, causing timestamp overflow, incorrect dates, or system failures when 32-bit signed integer limits are exceeded requiring using 64-bit timestamps to avoid Year 2038 problem and ensure timestamps work correctly beyond 2038 without overflow issues.
Not accounting for daylight saving time (DST) transitions causing time discrepancies, when timestamp conversions occur during DST transitions (spring forward, fall back) without considering DST changes, causing 1-hour time discrepancies, scheduling errors, or timezone confusion during DST transition periods requiring understanding DST transition dates and accounting for DST changes when converting between timezones or during DST transition periods for accurate timestamp handling.
Mixing timestamp formats (seconds vs milliseconds) inconsistently causing conversion errors, when timestamp handling inconsistently mixes second-based and millisecond-based formats without proper detection or conversion, causing incorrect time calculations, format confusion, or conversion errors requiring consistent timestamp format usage or automatic format detection to properly handle both seconds (10 digits) and milliseconds (13 digits) timestamp formats accurately.
Not storing timestamps in UTC format causing timezone-related bugs, when application timestamps are stored in local time instead of UTC, causing timezone-related bugs, DST issues, or inconsistent time handling across different user timezones requiring storing all timestamps in UTC internally and converting to local time only for display purposes to ensure consistent, timezone-independent timestamp storage and handling.
Expecting leap seconds to be included in Unix timestamp calculations causing timing inaccuracies, when timestamp conversions expect leap seconds to be accounted for in Unix time, causing timing inaccuracies since Unix timestamps typically ignore leap seconds and maintain monotonic (continuously increasing) time requiring understanding that Unix timestamps ignore leap seconds for monotonic time, with leap second adjustments handled separately if precise astronomical time is needed.
Using timestamp converter for dates beyond browser date range limits causing conversion failures, when very old or very future dates are converted expecting browser date handling, causing conversion failures or incorrect results due to browser JavaScript date object limitations requiring staying within typical browser date ranges (approximately 1970 to beyond 2038 for 64-bit) and using specialized tools for extreme historical or future dates beyond standard browser date handling capabilities.
Not verifying converted timestamps against known reference times causing undetected errors, when timestamp conversions aren't verified against known reference timestamps, epoch times, or verified conversion tools, causing undetected conversion errors, timezone mistakes, or tool malfunction going unnoticed requiring verification of conversion results against known reference timestamps or alternative conversion tools to ensure accuracy and detect potential calculation or timezone errors.
Assuming relative time calculations are exact for all time periods causing accuracy issues, when relative time ("2 hours ago", "3 days ago") is expected to be exact for all periods, causing accuracy issues since relative time is approximate beyond days and depends on locale clock accuracy requiring understanding that relative time is approximate, especially for longer periods, and exact time differences need calculated timestamp differences rather than relative time approximations for precise time calculations.
Yes, both formats are supported. The tool automatically detects timestamp format: timestamps with larger magnitudes (typically 13 digits, > 1×10¹⁰) are treated as milliseconds, while smaller timestamps (typically 10 digits) are treated as seconds. For example, 1609459200 = seconds (January 1, 2021), while 1609459200000 = milliseconds (same date). The converter handles both formats automatically for flexible timestamp input and conversion.
The converter supports UTC, Local (your computer's timezone), and a curated list of common timezones. For detailed timezone math with full timezone database support, programming language date libraries provide comprehensive timezone handling. The UI focuses on core cases: UTC (standard reference), Local (user's timezone), and common timezone conversions. For complex timezone calculations, use the converter for verification and language-specific date libraries for full timezone database support.
The Year 2038 problem occurs when 32-bit signed integer Unix timestamps overflow on January 19, 2038 at 03:14:07 UTC. 32-bit systems will incorrectly interpret timestamps after this date. Solution: use 64-bit timestamps which extend far beyond 2038. Modern systems use 64-bit timestamps, but legacy 32-bit systems may encounter this issue. The converter handles 64-bit timestamps, avoiding Year 2038 limitations for current and future date calculations.
ISO 8601 format defaults to UTC time with Z suffix (e.g., 2024-01-01T00:00:00Z), while Local time adjusts to your computer's timezone. The same timestamp represents the same moment in time, but displayed in different timezones. UTC is timezone-neutral, while Local shows time in your timezone (may differ by hours depending on your offset from UTC). Both represent the same instant, just in different timezone contexts.
Yes, all timestamp conversions happen entirely locally in your web browser using client-side JavaScript. No timestamps, conversion data, or time information is transmitted to external servers. Your timestamp conversions remain completely private on your device. The tool works offline once loaded, allowing timestamp conversions without internet connectivity while maintaining complete privacy and security of your timestamp data throughout the conversion process.
Use your programming language's date/time APIs: JavaScript (new Date(), toISOString()), Python (datetime.fromtimestamp()), PHP (date(), DateTime), etc. Each language has built-in timestamp conversion functions. The converter helps verify your code's output—enter timestamps your code produces to verify they're correct. Use language-specific date APIs for programmatic conversion, and use this tool for manual verification, debugging, or quick reference conversions.
Relative time is approximate, especially beyond days. Accuracy depends on your computer's clock accuracy and locale settings. For precise time differences, calculate exact timestamp differences rather than relying on relative time approximations. Relative time is useful for human-readable displays but shouldn't be used for precise calculations. For exact time differences, use calculated timestamp differences in seconds, minutes, or hours for precision.
DST transitions cause 1-hour time jumps: spring forward (lose 1 hour), fall back (gain 1 hour, possible time overlap). During DST transitions, local time conversions may show ambiguous or skipped hours. Prefer UTC storage to avoid DST issues—UTC doesn't change with DST. When converting to local time during DST transitions, expect potential time discontinuities. Storing timestamps in UTC avoids DST-related conversion complexities and ensures consistent time representation.
Unix timestamps typically ignore leap seconds to maintain monotonic (continuously increasing) time. Leap seconds are occasional 1-second adjustments to Coordinated Universal Time (UTC) to account for Earth's rotation variations. Unix time continues linearly without leap second adjustments. If precise astronomical time is needed, use specialized time systems that account for leap seconds. For most applications, Unix timestamps without leap seconds provide sufficient accuracy and monotonic time progression.
Browser JavaScript date ranges limit extremes: approximately year 1970 (Unix epoch start) to year 275760 (far future). Typical applications are well within this range. Very old historical dates (before 1970) or extremely future dates may encounter browser limitations. For dates beyond typical ranges, use specialized date handling tools or server-side date processing. The converter handles common timestamp ranges used in modern applications and systems.
To convert Unix timestamp to date: enter timestamp (seconds or milliseconds) and view human-readable formats (UTC, Local, ISO 8601, RFC). To convert date to timestamp: select Date, Time, and Timezone, then generate timestamp. The converter provides bidirectional conversion: timestamp → date (enter timestamp) and date → timestamp (enter date components). All conversions show multiple format outputs (UTC, Local, ISO, RFC) for comprehensive date/time representation and verification.
UTC (Coordinated Universal Time) is timezone-neutral, standard reference time used globally. Local time is adjusted to your computer's timezone setting (may include DST adjustments). Same timestamp shows different times in UTC vs Local—UTC is constant, while Local varies by timezone. For example, 1609459200 (Unix seconds) = 2021-01-01 00:00:00 UTC, but may show as 2020-12-31 19:00:00 in EST (UTC-5). Always store timestamps in UTC; convert to Local only for display.