Unix Timetamp Full Guide: sec to ms, time zone to connect
A list of the logs. 1713171485interface field createdAt: 1713171485000Or from JWT expAnd they're asking the same thing:What time?♪ With theSeconds or milliseconds?Did you show it?Time zone is wrong.。 This Guide describes the Epoch engagement, unit judgement, KiloCell of-scale operational steps and associated scenes, and describes the relationship with JWT expired fields.
The core sentence.
Unix Time stamp is "the amount of traffic since 1970-01-01:00 UTC" The number of digits is counterproductive, the dates are miscalculated for decades, the time zone only influences how to show, and does not change the absolute time of the same moment.
It's just right there. Unix Timetamp Conversion Check: Real time current stamp, date stamp, date stamp.
Epoch, what the hell are you thinking?
Unix Timestamps (Epoch) usually indicate from UTC The number of seconds (or milliseconds) passed from the beginning of the age, without regard to the daily schedule of works for the second. It is appropriate for sorting, storage, cross-linguistic transmission; It's not appropriate to read "What time of week" directly — it's a matter of formatting and time zones.
| Concept | Meaning | Common misunderstandings |
|---|---|---|
| Time stamp value | Absolute instantaneous measure | I thought, "Take Beijing time in the numbers." |
| Local display | Formatting the same moment with a time zone rule | Changed the display is the same as a jab. |
| UTC Display | Calendar Time in Zero Timezone | It's not the same thing as "no time zone." |
| ISO 8601 | With offset or Z Standard text |
It's a digitized stamp that can be exchanged but in different forms. |
Use "Now Time" at the top of the page Date.now() PresentationmillisecondsLevel 1 is currently stamped and displays the current time zone name and UTC deviation to help confirm what your computer thinks is "now".
2. secs and ms: digits are not genres
| Form | Typical bits | Units | Common sources |
|---|---|---|---|
| About 10 places. | ~10 | sec | Many backends, PHP, Python time.time() & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & exp/iat |
| 13 bits or so | ~13 | milliseconds | JavaScript Date.now()Part Java, front end site |
| 16 Degrees | More. | Microseconds/naste (unusual) | Database/system specific, this tool selects processing in seconds/ms |
Law of Experience:
- See the order of magnitude: the year 2020.secI'm gonna stick it around.
1.6e9～2e9；millisecondsAbout.1.6e12～2e12。 - Seconds when milliseconds:
new Date(1713171485)It's gonna be near 1970. - The milliseconds: the date will fly to the far future and the relative time will be shown as "N Day of the Future".
This tool, Timetamp Date, provides a unit pull down:sec (s) / ms(default milliseconds)You don't automatically change the unit you choose by the number.- Whichever you choose, The digits are just a clue to your judgment. The dot "current" will fill in the current millisecond stamp and set the unit to ms.
Time zone: two sets of calendar readings in the same moment
After the conversion is successful, the results table gives:
| Okay. | Meaning | When do you look at it? |
|---|---|---|
| Beijing Time (Local) | Browser Local Timezone Formatting (toLocaleString） |
Matches your calendar, chats, |
| UTC Time | Force timeZone: "UTC" Number of readings |
Alignment with server logs, cross-section colleagues |
| ISO 8601 | toISOString(), generally Z End |
Write API, Configure, Cross-linguistic |
| Relative Time | The description of the current rough particle size | Quick judgement "just happened / long ago / the future" |
Note: When the label says "Local Time" you're not in Eastern District.Local localNot forced Asia/Shanghai. Please look at UTC and ISO at the same time as the time zone is wrong.
Date Queuettal datetime-localPressBrowser Local Time ZoneExplain the time you choose for the wall clock, and output the seconds and the milliseconds. When "I want to be in the East 8" but the computer is in the US Time Zone, it's not perfect -- it's a system shift, or it's only UTC/ISO.
4. A little link to JWT `exp '
In the JWT registration statement exp、iat、nbf It's a normative matter. NumericDate, in seconds。 When the 401 "expired" is coordinated:
- Use JWT decoder Read
exp. Values and tools give local tips. - - Put the same number in. Timetamp Tool, selected unit seccheck that UTC/local has passed.
- Don't do it.
expWhen the milliseconds are analyzed, the judgment is "premature".
Time stamping tools are not responsible for signing; It only helps you to count "digital reading time".
5. Phased operation
A. Time stamp dates
- Open /tools/time/timestamp。
- Enter a number in the Time stamp date (with a point at the top to copy the current stamp exercise).
- Draw selection under units sec or milliseconds(consistent with data sources).
- Points Convert。 The results table is shown for success; Could not close temporary folder: %s
- I'll be on my own when I need to be. Copy, or points Current Fill in now milliseconds.
Dates and timetamps
- Date time control selected for Date Turn Timetamp (points Current Reset to now.
- Points Convert,Read sec (10 bit) and msec (13 bit) Two rows.
- Determines whether seconds or milliseconds are required for the end when writing to API or SQL.
Capacity boundaries
- Support: Real time millisecond stamp, second/misecond rotation display, local inverse with UTC, ISO, relative time, date control.
- No substitute: Complete IANA time zone selection, astronomical time of azimuth, service-end authority NTP.
- There's something else at the same station. /tools/converter/unix-timestamp When entering, practice will be based on the main tool path of this section; Concepts are universal.
Common error comparisons
| phenomena | Common causes | Processing |
|---|---|---|
| It's been down since 1970. | Seconds poking, and then deciphering in milliseconds, or several orders of magnitude. | The change in the unit is "seconds". Checking the number of digits |
| It's a long way to go. | milliseconds to seconds | Change unit to millisecond |
| 8 hours difference with server | Only local strings. No UTC. | Harmonize UTC or ISO comparisons |
| And the database is missing. | Quarter of the library session,TIMESTAMP vs TIMESTAMPTZ |
Chat-type attendees time_zone |
| Status "Format error" | Paste non-number, commas, unit suffix | Only integer numbers left |
| "Irreviable time frame." | Expiry or illegal | Check if there's one more sticker and whether there's a scientific algorithm. |
| Show "The Future" relatively | Puncts greater than now (or in units amplified) | Check Unit versus Clock |
| JWT Expiry 401 | It's more than just a matter of time:aud/Signature/Gategate |
Decode JWT. All right, time is just one floor. |
| Date control result "Nor" | This is a different time zone from the one in which we operate. | Communication or calibration system time zone with UTC |
| Frontend JS is 1,000 times different from backend | One end of second, one end of millisecond. | Write dead units in contracts and add examples |
Recommended check order
- Unit (sec/ms).
- Whether it was the same moment (see UTC/ISO, not "8 pm" in the words).
- The time is right (not synchronized NTP will "offset") on this machine.
- Whether business fields are really Epoch (some are business days serial numbers).
7. Real work landscape
Scenario A: Are interface fields expired or not?
Response expireAt: 1735689600。 Select the seconds to convert, see if UTC has passed. If the product is written as "Beijing time 2025-01-010 points", use local lines and products to determine whether or not the East Eight is interpreted as such.
Scene B: What's the SQL condition?
The product says "Statistics yesterday, East Eight was all day." First calculate the clock, turn it into seconds or milliseconds (similar to column type), then write it. WHERE created_at >= ? AND created_at < ?。 Avoids mixing string dates with stamped time zones in SQL.
Scenario C: Log Alignment Accident Window
Multiple machine logs have played ISO, some have played Epoch. The whole thing goes to UTC and then it's sorted, and it's "a failure of a cascade of the same minute."
scene D: Frontend Date With backsec
Node/browser is used to milliseconds; A lot of Go/Java interfaces in seconds. The JLS writes examples of death: each of the same seconds and the same milliseconds is shown, and the tool is cross-checked.
The E:JWT login "Tomorrow Expires" failed.
Decoding exp (a) For seconds, confirm with this tool; If the time is correct, turn to the signature,nbf..the gateway clock. See JWT decoded guide(if published) or tool page.
Scenario F: Exporting the report to Operations
Don't just give nudity. Export ISO or specify local time for the time zone; Attach Epoch column to the unit where re-processing is required.
9. Collaboration and compact proposals
- API documents state each time field:
unix secondsorunix millisecondsAnd give one example. - It's a ban on the same resources being used in both units, but it's the same name.
timestamp。 - (a) Monitoring and alerting UTC; The email to humans is re-formatted locally.
- (b) The container mirror ensures NTP; Otherwise, "Import token expired" will become a barrier black hole.
- Test kit fixed for one or two seconds (e.g.
1700000000The whole chain asserted readable time.
FAQ
Why is "local" not Beijing time on my computer?
Tools are formatted by the browser time zone. When the system time zone is in Tokyo or Los Angeles, the local line is not East Eight. Cross-regional collaboration request UTC or ISO.
10 bits and 13 bits of "standards"?
It's all common engineering practice. JWT with many back end sidings; JS is misecond. The standard is... Agreed unitsNot digital superstition.
Is that relative to the "just"?
It is a crude particle scale reminder and is not the basis for the audit. The exact contrast is to be made with ISO or to copy the seconds with milliseconds.
2038. Do you have any more questions?
32 bits of symbol seconds will spill over 2038; The modern system is used 64 bits. The old library table design of 32-bit symbols in seconds is avoided when selecting storage type. This tool is in JS Date Work within safe limits, extreme aging/fate futures may show anomalies.
Is the date retweeting a summer's day?
datetime-local Interpretation by operational environment rules. When you cross the summer shift, priority is given to UTC for distribution in fixed instant.
Can you batch conversion CSV?
This page interacts with a single value. Batch is provided in scripts, but this page is used to test whether the boundary values are consistent with the script.
I'm gonna need a time for the online conversion?
Calculates the local completion of the browser. Time stamp itself is usually less sensitive than the password, but is still less sensitive when it is combined with the order number, etc.
One second from Beijing Times?
Refreshs at different times, or rounded to the second at one end. is the same input number and the unit is unified.
Continue reading
(a) Copying the current mst stamp at the top of the page, toggle the strm/ms and experience a difference in the magnitude; Take another JWT test. exp(sec) Walk over.