Unix timestamp converter

Unix timestamp converter: epoch seconds, milliseconds, microseconds or nanoseconds to an ISO 8601 UTC date and local time, and dates back to epoch time.

হালনাগাদ ২৮ সেপ্টেম্বর, ২০২৬যাচাই করা উদাহরণ: ৮

একক রূপান্তর

Timestamp

Digits (optionally negative or with a decimal part), an ISO 8601 date-time such as 2026-01-15T09:00:00Z, or “now”.

Timestamp unit

Time zone

চেষ্টা করুন

ISO 8601 (UTC)

2026-09-29T05:10:36.154Z

Local time in the chosen zone: 2026-09-29 05:10:36.154 (UTC+00:00)
Unix seconds: 1790658636.154
Milliseconds: 1790658636154
Microseconds: 1790658636154000
Nanoseconds: 1790658636154000000
Day of the week (UTC): Tuesday
Read as: current time
Relative to now: Now

Unix time 1790658636.154 is 2026-09-29T05:10:36.154Z, a Tuesday, which is the current time.

Where this instant sits

যেভাবে হিসাব করা হয় S

Days and seconds since the epoch
$1790658636 = 86400 \times 20725 + 18636$
Unix time ignores leap seconds: every day has exactly 86,400 seconds.
Day number to calendar date
Day 20725 after 1 January 1970 is Tue 29 Sep 2026; 18636 s after midnight is 05:10:36 UTC.
Shift to the chosen zone
UTC is UTC+00:00 at that instant, so the local time is 2026-09-29 05:10:36.154 (Tue 29 Sep 2026).

Unix timestamp converter সম্পর্কে

A Unix timestamp counts the seconds since 00:00:00 UTC on 1 January 1970, the Unix epoch, with every day counted as exactly 86,400 seconds. The converter splits the count into whole days and seconds of the day, turns the day number into a calendar date, then applies the chosen zone's offset from the IANA time zone database. Date to timestamp runs the same steps backwards.

Developers use it to read log lines, database columns and API fields. With the unit left on automatic, up to 11 digits are read as seconds, 12 to 14 as milliseconds, 15 to 17 as microseconds and 18 or more as nanoseconds, so 1700000000000 is read as milliseconds: 22:13:20 UTC on 14 November 2023.

Results cover the years 0001 to 9999, the range of a four-digit ISO 8601 year. Negative timestamps are instants before 1970; −86400 is midnight UTC on 31 December 1969.

সমাধান করা উদাহরণ

The epoch

একক রূপান্তর: Timestamp to date
Timestamp: 0
Timestamp unit: Seconds
Time zone: UTC

ISO 8601 (UTC): 1970-01-01T00:00:00Z
Day of the week (UTC): Thursday

যাচাইয়ের উৎস: POSIX definition; Python datetime.fromtimestamp(0, timezone.utc)

Largest signed 32-bit value (year 2038)

একক রূপান্তর: Timestamp to date
Timestamp: 2147483647
Timestamp unit: Detect from length
Time zone: UTC

ISO 8601 (UTC): 2038-01-19T03:14:07Z
Read as: seconds

যাচাইয়ের উৎস: Python 3.8: datetime.fromtimestamp(2147483647, timezone.utc)

Milliseconds shown in India

একক রূপান্তর: Timestamp to date
Timestamp: 1700000000000
Timestamp unit: Detect from length
Time zone: India (Kolkata)

ISO 8601 (UTC): 2023-11-14T22:13:20Z
Local time in the chosen zone: 2023-11-15 03:43:20 (UTC+05:30)
Unix seconds: 1700000000
Read as: milliseconds

যাচাইয়ের উৎস: Python 3.8: datetime.fromtimestamp(1700000000, tz=Asia/Kolkata) = 2023-11-15 03:43:20+05:30

Negative timestamp

একক রূপান্তর: Timestamp to date
Timestamp: -86400
Timestamp unit: Seconds
Time zone: UTC

ISO 8601 (UTC): 1969-12-31T00:00:00Z
Day of the week (UTC): Wednesday

যাচাইয়ের উৎস: Python 3.8: datetime.fromtimestamp(-86400, timezone.utc)

প্রশ্ন

What is the year 2038 problem?

Software that stores Unix time in a signed 32-bit integer can count only to 2,147,483,647 seconds, reached at 03:14:07 UTC on 19 January 2038. One second later the value wraps to −2,147,483,648, which reads as 20:45:52 UTC on 13 December 1901. A signed 64-bit count, the usual size on current 64-bit systems, lasts about 292 billion years.

How can I tell whether a timestamp is in seconds or milliseconds?

Count the digits. Present-day times have 10 digits in seconds, 13 in milliseconds, 16 in microseconds and 19 in nanoseconds; the seconds count reached 1,000,000,000 on 9 September 2001 and stays at 10 digits until 20 November 2286. JavaScript's Date.now() and Java's System.currentTimeMillis() return milliseconds, while the shell command date +%s and Python's time.time() return seconds.

Does Unix time count leap seconds?

No. POSIX defines every day as 86,400 seconds, so the 27 leap seconds added to UTC between 1972 and 2016 have no timestamps of their own, and 23:59:60 cannot be written as Unix time. Systems either repeat a second when one occurs or spread it out; Google, for example, smears a leap second over the 24 hours from noon to noon UTC.

Is a Unix timestamp the same in every time zone?

Yes. A timestamp names one instant, and the zone only changes how that instant is written. Timestamp 0 is 00:00 UTC on 1 January 1970, which was 05:30 the same day in India, 19:00 on 31 December 1969 in New York, and 01:00 in London, where British Standard Time kept clocks on UTC+01:00 all year from 1968 to 1971.

How do I get the current Unix timestamp?

Type now in the timestamp box, or ask the system clock: date +%s in a Linux or macOS shell, Math.floor(Date.now() / 1000) in JavaScript, int(time.time()) in Python, and SELECT UNIX_TIMESTAMP() in MySQL. The count grows by 86,400 a day and passes 1,800,000,000 at 08:00 UTC on 15 January 2027.

“Unix timestamp converter” কতটা নির্ভুল?

নির্ভুলতা আপনার ইনপুট ও পদ্ধতির অনুমানের ওপর নির্ভর করে। দশমিক গণনায় 50টি সার্থক অঙ্ক ব্যবহৃত হয়, কিন্তু আনুমানিক হিসাব, সংখ্যাগত পদ্ধতি ও উৎসের তথ্য কম নির্ভুল হতে পারে; প্রদর্শিত মান রাউন্ড করলে এই সীমাবদ্ধতাগুলি দূর হয় না। স্বতন্ত্র উৎসের সমাধানের সঙ্গে যাচাই করা উদাহরণ: ৮। যেমন, “The epoch” উদাহরণটি POSIX definition; Python datetime.fromtimestamp(0, timezone.utc)-এর সঙ্গে যাচাই করা হয়।

এই পদ্ধতির উৎস কী?

POSIX.1-2017, §4.16 Seconds Since the Epoch; ISO 8601-1:2019 — Date and time representations; IANA Time Zone Database.

এই ক্যালকুলেটর সম্পর্কে

t = 86400 \times N(\text{date}) + 3600h + 60m + s,\qquad N = \text{days since 1970-01-01}

উৎস

POSIX.1-2017, §4.16 Seconds Since the Epoch
ISO 8601-1:2019 — Date and time representations
IANA Time Zone Database

তথ্যসূত্রের সঙ্গে যাচাই করা

এই ক্যালকুলেটরে স্বাধীন উৎস থেকে উত্তর নেওয়া ৮টি সমাধান করা উদাহরণ রয়েছে। এগুলি পরীক্ষার সমষ্টিতে চালানো হয়, আর আপনি এখানেও চালাতে পারেন।