Timestamp Converter for Unix Seconds, Milliseconds, UTC, ISO, and Timezones
Convert Unix timestamps, epoch time, ISO 8601 strings, UTC values, and readable date-time text in both directions. The tool supports second and millisecond timestamps, IANA timezone selection, current timestamp copy, timestamp-to-date conversion, date-to-timestamp conversion, and practical checks for APIs, logs, databases, scheduled jobs, cache expiry, and cross-timezone product behavior.
- Convert 10-digit Unix seconds and 13-digit Unix milliseconds
- View current time, conversion results, and UTC reference values in a selected timezone
- Parse ISO 8601, RFC 2822, HTTP Date, YYYY-MM-DD HH:mm:ss, and other common date-time formats
- Useful for API debugging, log timelines, SQL time ranges, scheduled jobs, and expiry checks
Timestamp Converter
Convert Unix seconds, milliseconds, readable date-time text, ISO/UTC values, and timezone-aware time formats.
Current timestamp
1779361427
2026-05-21 11:03:47
Timestamp to time
Conversion result
2026-05-21 11:03:47
Timestamp: 1779361427
ISO: 2026-05-21T11:03:47.000Z
UTC: 2026-05-21T11:03:47.000Z
Time to timestamp
Conversion result
1779361427
Parsed as: Format: yyyy-MM-dd HH:mm:ss
ISO: 2026-05-21T11:03:47.000Z
UTC: 2026-05-21T11:03:47.000Z
Core features
These are the functions available in the tool itself, focused on the three timestamp problems that cause the most mistakes: unit, timezone, and input format.
- Live current timestamp
- Show the current Unix timestamp in seconds or milliseconds, pause the live value, and copy a stable reference for tests.
- Timestamp to date and time
- Convert Unix seconds or milliseconds into readable date-time output for the selected timezone, with ISO and UTC references.
- Date and time to timestamp
- Convert local time, ISO strings, RFC dates, or HTTP Date values into Unix timestamps using the source timezone you choose.
- IANA timezone search
- Select standard timezone names such as UTC, Asia/Shanghai, Europe/London, and America/New_York.
- Flexible date parser
- Parse hyphen, slash, dot-separated, compact numeric, ISO offset, UTC Z suffix, RFC, and HTTP date strings.
- One-click result copy
- Copy the current timestamp, converted local time, ISO string, or generated timestamp for API parameters and test cases.
How to use the timestamp converter
Choose the unit and timezone before converting. Most timestamp bugs come from mixing seconds with milliseconds or treating local time as UTC.
- 1
Select a reference timezone in the current time section, then choose whether you need seconds or milliseconds.
- 2
To convert a timestamp to a date, paste the numeric value into Timestamp to time, choose the input unit, and select the output timezone.
- 3
To convert a date to a timestamp, enter the date-time text in Time to timestamp and select the timezone that the input represents.
- 4
Check the local result, ISO value, and UTC reference to make sure they match the system you are testing.
- 5
Use the copy buttons to move timestamps or ISO values into API requests, SQL queries, log notes, config files, or test scripts.
Built for development and debugging
The page makes timezone and unit choices explicit instead of hiding them behind the browser locale.
- Seconds and milliseconds are available for the live clock, timestamp input, and generated output.
- The same timestamp can be viewed in different timezones, which helps diagnose offset errors and date-boundary bugs.
- ISO values with Z or an offset such as +08:00 are parsed as absolute moments before any display timezone is applied.
- Date-time text without an offset is interpreted in the selected source timezone, which is important for user-local workflows.
- UTC output remains visible so you can compare results with databases, logs, backend services, and queues.
- The live current timestamp can be paused to create repeatable test data or record a stable incident timeline point.
- Input parsing covers common date values from logs, spreadsheet exports, HTTP headers, email headers, and API responses.
Common use cases
Timestamp conversion matters whenever a stored moment has to line up with human-readable time, system logs, API contracts, and user-facing schedules.
When the timestamp represents a meeting, release, billing cutoff, or user-local event, compare the final moment across regions with the Timezone Converter . If you are calculating a trial length, SLA window, campaign span, or due date before producing the timestamp, work it out first in the Date Calculator so the Unix value reflects the right business rule.
API debugging
Check whether a payload uses 10-digit seconds or 13-digit milliseconds, then confirm the displayed date matches the expected timezone.
Log investigation
Turn Unix timestamps from logs into readable local or UTC time so request, task, alert, and error sequences are easier to compare.
Database queries
Prepare time range values for fields such as created_at, updated_at, expires_at, and deleted_at.
Scheduled jobs and expiry rules
Validate Cron runs, delayed queues, cache expiration, retry timing, token expiry, and background job parameters.
Cross-timezone product logic
Check bookings, meetings, billing cycles, campaign starts, and user-local date rules across different regions.
Frontend and backend alignment
Compare browser display time, user timezone, UTC storage, and API timestamp fields during integration testing.
Timestamp and timezone concepts
These terms explain why a value can look eight hours off, one day off, or exactly one thousand times too large or too small.
Unix timestamp / epoch time
A Unix timestamp counts elapsed time since 1970-01-01 00:00:00 UTC. It represents an absolute moment and does not carry a timezone.
Unix seconds
Second-based timestamps are usually 10 digits, for example 1715241600. They are common in backend APIs, databases, and command-line tooling.
Unix milliseconds
Millisecond-based timestamps are usually 13 digits, for example 1715241600000. JavaScript Date.now() returns milliseconds.
UTC
UTC is the zero-offset time reference. Databases, logs, and distributed services often store and compare time in UTC, then convert it for display.
IANA timezone
Names such as Asia/Shanghai, Europe/Berlin, and America/Los_Angeles include regional rules and are usually better than fixed offsets for business time.
Timezone offset
Offsets such as +08:00 and -05:00 describe the difference between local time and UTC. If the input includes an offset, it should define the absolute moment.
ISO 8601
Common in APIs and logs, for example 2026-05-09T06:30:00Z or 2026-05-09T14:30:00+08:00. The Z suffix means UTC.
Local date-time text
A value like 2026-05-09 14:30:00 contains a calendar date and clock time, but not a timezone. A source timezone is required to produce one exact timestamp.
UTC reference value
A UTC result gives you a stable cross-system reference for assertions, incident reviews, multi-region log comparison, and data migrations.
Supported date-time input formats
These formats work in the time-to-timestamp flow. If the input contains a Z suffix or timezone offset, that absolute time is used first. If it does not, the selected source timezone is applied.
Format
YYYY-MM-DD HH:mm:ss
Example
2026-05-09 14:30:00
Notes
Recommended for development and testing because it is readable and low ambiguity.
Format
YYYY-MM-DD HH:mm
Example
2026-05-09 14:30
Notes
Seconds default to 00, which works well for minute-level scheduling checks.
Format
YYYY/MM/DD HH:mm:ss
Example
2026/05/09 14:30:00
Notes
Often appears in exported logs, spreadsheets, and manually entered data.
Format
YYYY.MM.DD HH:mm:ss
Example
2026.05.09 14:30:00
Notes
Dot-separated dates are supported for compatibility with older system output.
Format
YYYYMMDDHHmmss
Example
20260509143000
Notes
Compact numeric style used in batch jobs, filenames, sequence numbers, and legacy fields.
Format
MM/DD/YYYY HH:mm:ss
Example
05/09/2026 14:30:00
Notes
Month-first format. For international work, ISO or year-month-day format is safer.
Format
DD/MM/YYYY HH:mm:ss
Example
09/05/2026 14:30:00
Notes
Day-first format. It can be ambiguous when both day and month are 12 or below.
Format
HH:mm:ss
Example
14:30:00
Notes
Time-only input uses the current date in the selected source timezone.
Format
ISO 8601 with offset
Example
2026-05-09T14:30:00+08:00
Notes
An absolute time value. The embedded offset is used before display conversion.
Format
UTC ISO (Z)
Example
2026-05-09T06:30:00Z
Notes
Z means UTC. This format is common in API responses, database exports, and distributed logs.
Format
RFC 2822 / HTTP Date
Example
Sat, 09 May 2026 06:30:00 GMT
Notes
Common in email headers, HTTP headers, cache metadata, and browser network panels.
Frequently asked questions
Answers to common questions about usage, data handling, result checks, and practical limits.
01 What is a Unix timestamp?
What is a Unix timestamp?
A Unix timestamp is a number counted from 1970-01-01 00:00:00 UTC. It represents an absolute point in time, independent of the timezone used to display it.
02 Are epoch time and Unix timestamp the same thing?
Are epoch time and Unix timestamp the same thing?
In most developer tools and API documentation, they refer to the same idea: elapsed seconds or milliseconds since the Unix epoch.
03 How do I tell seconds from milliseconds?
How do I tell seconds from milliseconds?
Unix seconds are usually 10 digits. Unix milliseconds are usually 13 digits. If the converted date is wildly wrong, check the unit first.
04 Why does the same date-time text produce different timestamps in different timezones?
Why does the same date-time text produce different timestamps in different timezones?
A local value such as 2026-05-09 14:30:00 has no timezone by itself. Shanghai 14:30 and New York 14:30 are different absolute moments.
05 What does the Z suffix mean in an ISO timestamp?
What does the Z suffix mean in an ISO timestamp?
Z means UTC. For example, 2026-05-09T06:30:00Z is a UTC time. It may display as a different clock time in another timezone, but the timestamp stays the same.
06 Should an API use seconds or milliseconds?
Should an API use seconds or milliseconds?
It depends on the contract. Many backend APIs use seconds, while JavaScript Date.now() returns milliseconds. The API documentation should state the unit clearly.
07 Why do logs sometimes look eight hours off?
Why do logs sometimes look eight hours off?
The log may be stored in UTC while you are reading it as local time. Convert the value to UTC and your target timezone to confirm the offset.
08 Does the tool support natural language dates?
Does the tool support natural language dates?
It supports limited English natural language parsing, such as next Friday. For repeatable tests and API work, ISO or YYYY-MM-DD HH:mm:ss is safer.
09 Does daylight saving time affect the result?
Does daylight saving time affect the result?
Yes. IANA timezones include regional daylight saving rules. A fixed offset such as +08:00 does not include those rules.
10 Is any time data uploaded?
Is any time data uploaded?
No. Parsing, timezone conversion, and timestamp generation run locally in the browser.
11 How can I avoid timestamp bugs in production?
How can I avoid timestamp bugs in production?
Store and compare time in UTC, convert only for display, document whether fields use seconds or milliseconds, and test date-boundary, daylight-saving, and cross-timezone cases.
More date, time, and timezone tools
Continue with timezone conversion, date difference calculation, date arithmetic, and world clock tools for cross-timezone meetings, scheduling, billing cycles, cache expiry, and log timelines.