Turn a DATE input into a TIMESTAMP output in a few clicks—ideal for normalizing time values for apps, logs, and data workflows.
Convert any date and time to a Unix timestamp instantly with the XConvert Date to Timestamp Converter. Select a date, set the time, choose your time zone, and get the corresponding epoch value in seconds or milliseconds. This free, client-side tool runs entirely in your browser — no data is sent to any server.
Whether you are setting expiration times for API tokens, configuring scheduled tasks, writing database queries with date filters, or generating test data, converting human-readable dates to Unix timestamps is a routine task in software development. The XConvert Date to Timestamp Converter makes this conversion instant and error-free, eliminating the mental math and time zone confusion that come with manual calculation.
The converter also shows the current date and time as a Unix timestamp for quick reference, and supports both future and past dates, including dates before the Unix epoch (which produce negative timestamps). The interface is designed for speed — most conversions take a single click after entering the date, with no unnecessary steps or configuration screens.
A Unix timestamp (also known as epoch time, POSIX time, or Unix time) is a single integer that represents a specific moment in time. It counts the number of seconds that have elapsed since the Unix epoch — January 1, 1970, at 00:00:00 Coordinated Universal Time (UTC).
This representation is universal across programming languages, operating systems, and platforms. Unlike human-readable date strings, which vary by locale, format, and time zone, a Unix timestamp is unambiguous: the number 1713304195 means the same thing everywhere in the world — April 16, 2024, at 22:29:55 UTC.
Converting a date to a timestamp involves calculating the total number of seconds between the Unix epoch and the target date, accounting for leap years, varying month lengths, and time zone offsets. The XConvert converter handles all of this complexity automatically, including daylight saving time transitions that can shift the offset for a given time zone.
For the reverse operation — converting a timestamp back to a human-readable date — use the Unix Timestamp to Date Converter.
| Feature | XConvert Converter | Programming Language | Command Line (date) |
|---|---|---|---|
| Visual date picker | ✅ Yes | ❌ No | ❌ No |
| Time zone selection | ✅ All IANA zones | ✅ With libraries | ✅ TZ variable |
| Seconds and milliseconds | ✅ Both | ✅ Configurable | ✅ With format |
| DST handling | ✅ Automatic | ✅ With libraries | ✅ Automatic |
| Negative timestamps | ✅ Pre-1970 dates | ✅ Yes | ⚠️ Platform-dependent |
| No installation | ✅ Yes | ❌ Requires setup | ✅ Built-in |
| Batch conversion | ✅ Multiple dates | ✅ With scripting | ❌ One at a time |
| Mobile-friendly | ✅ Responsive | ❌ No | ❌ No |
| Reverse conversion | Link to Timestamp to Date | ✅ Yes | ✅ Yes |
| Cost | Free | Free | Free |
Setting Token Expiration Times — When creating JWTs or API tokens, you need to set the exp (expiration) claim as a Unix timestamp. Use the converter to calculate the exact timestamp for your desired expiration date and time, then embed it in the token. Verify the result with the JWT Decoder.
Writing Database Queries with Date Filters — Many databases store dates as Unix timestamps in integer columns. To query records from a specific date range, convert your start and end dates to timestamps and use them in WHERE clauses (e.g., WHERE created_at >= 1713225600 AND created_at < 1713312000).
Configuring Scheduled Tasks and Cron Jobs — Some scheduling systems accept Unix timestamps for one-time execution. Convert the desired execution date and time to a timestamp, ensuring you account for the correct time zone.
Generating Test Data — When writing tests that involve date-sensitive logic (expiration checks, time-based sorting, date range filtering), converting specific dates to timestamps lets you create deterministic test fixtures that do not depend on the current time.
Setting Cache Expiration Headers — HTTP cache headers like Expires and custom cache TTLs in CDN configurations sometimes use Unix timestamps. Convert the desired cache expiration date to a timestamp for precise control over content freshness.
Logging and Event Tracking — When manually creating log entries or event records that use epoch timestamps, the converter ensures you generate the correct value for the intended date and time, avoiding off-by-one errors from manual calculation.
Converting a human-readable date to a Unix timestamp requires accounting for several calendar complexities. The Gregorian calendar has months of varying lengths (28–31 days), leap years that add an extra day to February every four years (with exceptions for century years not divisible by 400), and time zones that offset the local time from UTC by varying amounts.
The conversion algorithm works by calculating the total number of days from the epoch (January 1, 1970) to the target date, multiplying by 86,400 (the number of seconds in a day), then adding the seconds from the time component (hours × 3600 + minutes × 60 + seconds). The time zone offset is then subtracted to convert from local time to UTC, since Unix timestamps are always in UTC.
Daylight saving time (DST) adds another layer of complexity. During DST transitions, a single time zone can have two different UTC offsets depending on the date. For example, US Eastern Time is UTC-5 during standard time and UTC-4 during daylight saving time. The XConvert converter uses the IANA time zone database (the same database used by operating systems and programming languages) to determine the correct offset for any date and time zone combination, including historical DST rules that have changed over the years. This means the converter correctly handles edge cases like the "spring forward" gap (where 2:00 AM jumps to 3:00 AM) and the "fall back" overlap (where 1:00 AM to 2:00 AM occurs twice).
The Unix epoch is the reference point for Unix timestamps: January 1, 1970, at 00:00:00 UTC. A timestamp of 0 corresponds to this exact moment. All Unix timestamps are measured as the number of seconds before (negative) or after (positive) this point.
The XConvert converter displays both the seconds and milliseconds timestamp for any date you enter. The millisecond value is simply the seconds value multiplied by 1,000, plus any sub-second precision. Copy the 13-digit millisecond value for use in JavaScript or APIs that expect millisecond precision.
Yes. The converter uses the IANA time zone database to determine the correct UTC offset for any date and time zone combination, including DST transitions. It correctly handles the spring-forward gap and fall-back overlap.
Yes. Dates before the Unix epoch produce negative timestamps. For example, December 31, 1969, at 23:59:59 UTC has a timestamp of -1. The converter supports any date within the range of JavaScript's Date object (approximately ±273,790 years from the epoch).
The converter provides a visual date picker, so you can select the date by clicking. You can also type dates in common formats like YYYY-MM-DD, MM/DD/YYYY, or DD/MM/YYYY. The tool parses most standard date formats automatically.
Because a Unix timestamp represents an absolute moment in time (UTC), and the same local date and time in different time zones corresponds to different absolute moments. Midnight in New York (UTC-5) occurs 5 hours after midnight in UTC, so the timestamp is 18,000 seconds larger.
The converter uses JavaScript's Date object, which supports dates from approximately April 20, 271,821 BCE to September 13, 275,760 CE. For practical purposes, this covers any date you are likely to need.
Yes. The converter supports batch input — enter multiple dates (one per line) and the tool will generate timestamps for all of them simultaneously.
No. Unix timestamps do not account for leap seconds. Each day is treated as exactly 86,400 seconds, regardless of whether a leap second was added. This is consistent with how virtually all software systems handle time.
Yes. Once the page has loaded, the XConvert Date to Timestamp Converter runs entirely in your browser using client-side JavaScript. All conversions are performed locally without any network requests.
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