Current Time With Seconds
The current Unix epoch time is
Convert epoch to human-readable date and vice versa
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Current Time With Seconds In India
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Epoch dates for the start and end of the year/month/day
Convert seconds to days, hours and minutes
What is epoch time?
The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (in ISO 8601: 1970-01-01T00:00:00Z).Literally speaking the epoch is Unix time 0 (midnight 1/1/1970), but 'epoch' is often used as a synonym for Unix time.Some systems store epoch dates as a signed 32-bit integer, which might cause problems on January 19, 2038 (known as the Year 2038 problem or Y2038).The converter on this page converts timestamps in seconds (10-digit), milliseconds (13-digit) and microseconds (16-digit) to readable dates.
| Human-readable time | Seconds |
|---|---|
| 1 hour | 3600 seconds |
| 1 day | 86400 seconds |
| 1 week | 604800 seconds |
| 1 month (30.44 days) | 2629743 seconds |
| 1 year (365.24 days) | 31556926 seconds |
How to get the current epoch time in ...
| PHP | time()More PHP |
| Python | import time; time.time()Source |
| Ruby | Time.now (or Time.new). To display the epoch: Time.now.to_i |
| Perl | timeMore Perl |
| Java | long epoch = System.currentTimeMillis()/1000; Returns epoch in seconds. |
| C# | DateTimeOffset.Now.ToUnixTimeSeconds() (.NET Framework 4.6+/.NET Core), older versions: var epoch = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds; |
| Objective-C | [[NSDate date] timeIntervalSince1970]; (returns double) or NSString *currentTimestamp = [NSString stringWithFormat:@'%f', [[NSDate date] timeIntervalSince1970]]; |
| C++11 | double now = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch()).count(); |
| Lua | epoch = os.time([date]) |
| VBScript/ASP | See the examples |
| AutoIT | _DateDiff('s', '1970/01/01 00:00:00', _NowCalc()) |
| Delphi | Epoch := DateTimetoUnix(Now); Tested in Delphi 2010. |
| R | as.numeric(Sys.time()) |
| Erlang/OTP | erlang:system_time(seconds). (version 18+), older versions: calendar:datetime_to_gregorian_seconds(calendar:universal_time())-719528*24*3600. |
| MySQL | SELECT unix_timestamp(now())More MySQL examples |
| PostgreSQL | SELECT extract(epoch FROM now()); |
| SQLite | SELECT strftime('%s', 'now'); |
| Oracle PL/SQL | SELECT (CAST(SYS_EXTRACT_UTC(SYSTIMESTAMP) AS DATE) - TO_DATE('01/01/1970','DD/MM/YYYY')) * 24 * 60 * 60 FROM DUAL; |
| SQL Server | SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE()) |
| IBM Informix | SELECT dbinfo('utc_current') FROM sysmaster:sysdual; |
| JavaScript | Math.floor(new Date().getTime()/1000.0) The getTime method returns the time in milliseconds. |
| Visual FoxPro | DATETIME() - {^1970/01/01 00:00:00} Warning: time zones not handled correctly |
| Go | time.Now().Unix()More Go |
| Adobe ColdFusion | <cfset epochTime = left(getTickcount(), 10)> |
| Tcl/Tk | clock seconds |
| Unix/Linux Shell | date +%s |
| Solaris | /usr/bin/nawk 'BEGIN {print srand()}' Solaris doesn't support date +%s, but the default seed value for nawk's random-number generator is the number of seconds since the epoch. |
| PowerShell | [int][double]::Parse((Get-Date (get-date).touniversaltime() -UFormat %s)) |
| Other OS's | Command line: perl -e 'print time' (If Perl is installed on your system) |
Convert from human-readable date to epoch
| PHP | strtotime('15 November 2018') (converts most English date texts) or:date_create('11/15/2018')->format('U') (using DateTime class) More PHP |
| Python | import calendar, time; calendar.timegm(time.strptime('2000-01-01 12:34:00', '%Y-%m-%d %H:%M:%S')) |
| Ruby | Time.local(year, month, day, hour, minute, second, usec ) (or Time.gm for GMT/UTC input). To display add .to_i |
| Perl | Use the Perl Epoch routines |
| Java | long epoch = new java.text.SimpleDateFormat('MM/dd/yyyy HH:mm:ss').parse('01/01/1970 01:00:00').getTime() / 1000; Timestamp in seconds, remove '/1000' for milliseconds. |
| VBScript/ASP | DateDiff('s', '01/01/1970 00:00:00', time field)More ASP |
| AutoIT | _DateDiff('s', '1970/01/01 00:00:00', 'YYYY/MM/DD HH:MM:SS') |
| Delphi | Epoch := DateTimeToUnix(StrToDateTime(myString)); |
| C | Use the C Epoch Converter routines |
| R | as.numeric(as.POSIXct('YYYY-MM-dd HH:mm:ss', tz = 'GMT', origin='1970-01-01')) The origin parameter is optional |
| Go | Example code |
| Adobe ColdFusion | int(parseDateTime(datetime).getTime()/1000); |
| MySQL | SELECT unix_timestamp(time) Time format: YYYY-MM-DD HH:MM:SS or YYMMDD or YYYYMMDDMore on using Epoch timestamps with MySQL |
| PostgreSQL | SELECT extract(epoch FROM date('2000-01-01 12:34'));With timestamp: SELECT EXTRACT(EPOCH FROM TIMESTAMP WITH TIME ZONE '2018-02-16 20:38:40-08');With interval: SELECT EXTRACT(EPOCH FROM INTERVAL '5 days 3 hours'); |
| SQLite | SELECT strftime('%s',timestring); |
| SQL Server | SELECT DATEDIFF(s, '1970-01-01 00:00:00', time field) |
| JavaScript | Use the JavaScript Date object |
| Unix/Linux Shell | date +%s -d'Jan 1, 1980 00:00:01' Replace '-d' with '-ud' to input in GMT/UTC time. |
Convert from epoch to human-readable date
| PHP | date(output format, epoch); Output format example: 'r' = RFC 2822 date, more PHP examples |
| Python | import time; time.strftime('%a, %d %b %Y %H:%M:%S +0000', time.localtime(epoch))Replace time.localtime with time.gmtime for GMT time. Or using datetime:import datetime; datetime.datetime.utcfromtimestamp(epoch).replace(tzinfo=datetime.timezone.utc) |
| Ruby | Time.at(epoch) |
| C# | private string epoch2string(int epoch) { |
| Perl | Use the Perl Epoch routines |
| Java | String date = new java.text.SimpleDateFormat('MM/dd/yyyy HH:mm:ss').format(new java.util.Date (epoch*1000)); Epoch in seconds, remove '*1000' for milliseconds. |
| Lua | datestring = os.date([format[,epoch]]) |
| VBScript/ASP | DateAdd('s', epoch, '01/01/1970 00:00:00')More ASP |
| AutoIT | _DateAdd('s', $EpochSeconds , '1970/01/01 00:00:00') |
| Delphi | myString := DateTimeToStr(UnixToDateTime(Epoch)); Where Epoch is a signed integer. |
| C | Use the C Epoch Converter routines |
| Objective-C | NSDate * myDate = [NSDate dateWithTimeIntervalSince1970:epoch]; NSLog(@'%@', date); |
| R | as.POSIXct(epoch, origin='1970-01-01', tz='GMT') |
| Go | Example code |
| Adobe ColdFusion | DateAdd('s',epoch,'1/1/1970'); |
| MySQL | FROM_UNIXTIME(epoch, optional output format) Default output format is YYY-MM-DD HH:MM:SS. If you need support for negative timestamps: DATE_FORMAT(DATE_ADD(FROM_UNIXTIME(0), interval -315619200 second),'%Y-%m-%d') (replace -315619200 with epoch) More MySQL |
| PostgreSQL | PostgreSQL version 8.1 and higher: SELECT to_timestamp(epoch);Source Older versions: SELECT TIMESTAMP WITH TIME ZONE 'epoch' + epoch * INTERVAL '1 second'; |
| SQLite | SELECT datetime(epoch_to_convert, 'unixepoch'); or local timezone: SELECT datetime(epoch_to_convert, 'unixepoch', 'localtime'); |
| Oracle PL/SQL | SELECT to_date('01-JAN-1970','dd-mon-yyyy')+(1526357743/60/60/24) from dualReplace 1526357743 with epoch. |
| SQL Server | DATEADD(s, epoch, '1970-01-01 00:00:00') |
| IBM Informix | SELECT dbinfo('utc_to_datetime',epoch) FROM sysmaster:sysdual; |
| Microsoft Excel / LibreOffice Calc | =(A1 / 86400) + 25569 Format the result cell for date/time, the result will be in GMT time (A1 is the cell with the epoch number). For other time zones: =((A1 +/- time zone adjustment) / 86400) + 25569. |
| Crystal Reports | DateAdd('s', {EpochTimeStampField}-14400, #1/1/1970 00:00:00#) -14400 used for Eastern Standard Time. See Time Zones. |
| JavaScript | Use the JavaScript Date object |
| Tcl/Tk | clock format 1325376000Documentation |
| MATLAB | datestr(719529+TimeInSeconds/86400,'dd-mmm-yyyy HH:MM:SS') |
| IBM PureData System for Analytics | select 996673954::int4::abstime::timestamp; |
| Unix/Linux Shell | date -d @1520000000 Replace 1520000000 with your epoch, needs recent version of 'date'. Replace '-d' with '-ud' for GMT/UTC time. |
| Mac OS X | date -j -r 1520000000 |
| PowerShell | Function get-epochDate ($epochDate){ [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($epochDate)) }, then use: get-epochDate 1520000000. Works for Windows PowerShell v1 and v2 |
| Other OS's | Command line: perl -e 'print scalar(localtime(epoch))' (If Perl is installed) Replace 'localtime' with 'gmtime' for GMT/UTC time. |
Thanks to everyone who sent me corrections and updates!
More date related programming examples: What's the current week number? - What's the current day number?
Please note: All tools on this page are based on the date & time settings of your computer and use JavaScript to convert times. Some browsers use the current DST (Daylight Saving Time) rules for all dates in history. JavaScript does not support leap seconds.
Time Exact
| C standard library |
|---|
| General topics |
| Miscellaneous headers |
|
The C date and time functions are a group of functions in the standard library of the C programming language implementing date and time manipulation operations.[1] They provide support for time acquisition, conversion between date formats, and formatted output to strings.
Overview of functions[edit]
The C date and time operations are defined in the time.hheader file (ctime header in C++).
| Identifier | Description | |
|---|---|---|
| Time manipulation | difftime | computes the difference in seconds between two time_t values |
time | returns the current time of the system as a time_t value, number of seconds, (which is usually time since an epoch, typically the Unix epoch). The value of the epoch is operating system dependent; 1900 and 1970 are often used. See RFC 868. | |
clock | returns a processor tick count associated with the process | |
timespec_get (C11) | returns a calendar time based on a time base | |
| Format conversions | asctime | converts a struct tm object to a textual representation (deprecated) |
ctime | converts a time_t value to a textual representation | |
strftime | converts a struct tm object to custom textual representation | |
wcsftime | converts a struct tm object to custom wide string textual representation | |
gmtime | converts a time_t value to calendar time expressed as Coordinated Universal Time[2] | |
localtime | converts a time_t value to calendar time expressed as local time | |
mktime | converts calendar time to a time_t value. | |
| Constants | CLOCKS_PER_SEC | number of processor clock ticks per second |
TIME_UTC | time base for UTC | |
| Types | struct tm | broken-down calendar time type: year, month, day, hour, minute, second |
time_t | arithmetic time type (typically time since the epoch) | |
clock_t | process running time type | |
timespec | time with seconds and nanoseconds |
The timespec and related types were originally proposed by Markus Kuhn to provide a variety of time bases, but only TIME_UTC was accepted.[3] The functionalities were, however, added to C++ in 2020 in std::chrono.
Example[edit]
The following C source code prints the current time to the standard output stream.
The output is:
See also[edit]
References[edit]
- ^ISO/IEC 9899:1999 specification(PDF). p. 351, § 7.32.2.
- ^open-std.org - Committee Draft -- May 6, 2005 page 355
- ^Markus Kuhn. 'Modernized API for ISO C'. www.cl.cam.ac.uk.
External links[edit]
| The Wikibook C Programming has a page on the topic of: C Programming/C Reference |
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