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How to get the current epoch time

2010-06-07 14:12 645 查看




 How to get the current epoch time in ...

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Perl
time


PHP
time()


Ruby
Time.now


(or 
Time.new


). To display the epoch: 
Time.now.to_i


Python
import
time


first, then 
time.time()


Java
long epoch =
System.currentTimeMillis()/1000;


Microsoft .NET C#
epoch
= (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) /
10000000;


VBScript/ASP
DateDiff("s",
"01/01/1970 00:00:00", Now())


Erlang
calendar:datetime_to_gregorian_seconds(calendar:now_to_universal_time(
now()))-719528*24*3600.


MySQL
SELECT
unix_timestamp(now())






PostgreSQL
SELECT
extract(epoch FROM now());


Oracle PL/SQL
SELECT
(SYSDATE - TO_DATE('01-01-1970 00:00:00', 'DD-MM-YYYY HH24:MI:SS')) *

24
* 60 * 60 FROM DUAL


SQL Server
SELECT
DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE())


JavaScript
Math.round(new
Date().getTime()/1000.0)


getTime() returns time in milliseconds.
Unix/Linux
date
+%s


Other OS's Command
line: 
perl -e "print time"


(If Perl is installed on your
system)




 Convert from human readable date to epoch

PerlUse these Perl
Epoch routines

PHP
mktime(hour

,
minute

,  second

, month

, day

, year

)






Ruby
Time.local(year

,
month

, day

, hour

, minute

, second

, usec

)


(or 
Time.gm


for GMT/UTC input). To display add 
.to_i


Python
import
time


first, then 
int(time.mktime(time.strptime('2000-01-01
12:34:00', '%Y-%m-%d %H:%M:%S')))  - time.timezone


Java
long epoch =
new java.text.SimpleDateFormat ("dd/MM/yyyy
HH:mm:ss").parse("01/01/1970 01:00:00");


VBScript/ASP
DateDiff("s",
"01/01/1970 00:00:00", time field

)






MySQL
SELECT
unix_timestamp(time

)


Time format: YYYY-MM-DD HH:MM:SS or
YYMMDD or YYYYMMDD
More
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 '2001-02-16
20:38:40-08');


With interval: 
SELECT EXTRACT(EPOCH FROM
INTERVAL '5 days 3 hours');


SQL Server
SELECT
DATEDIFF(s, '1970-01-01 00:00:00', time field

)


JavaScriptuse the JavaScript
Date object

Unix/Linux
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

PerlUse these Perl
Epoch routines

PHP
date(output
format

, epoch

);


Output format example: 'r' = RFC 2822
date



Ruby
Time.at(epoch

)


Python
import
time


first, then 
time.strftime("%a, %d %b %Y %H:%M:%S
+0000", time.localtime(epoch

))


Replace time.localtime with time.gmtime for GMT time.



Java
String date
= new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new
java.util.Date (epoch

*1000));


VBScript/ASP
DateAdd("s",
epoch

, "01/01/1970 00:00:00")






PostgreSQLPostgreSQL
versi
4000
on 8.1 and higher: 
SELECT to_timestamp(epoch

);






Older versions: 
SELECT
TIMESTAMP WITH TIME ZONE 'epoch' + epoch

* INTERVAL '1 second';


MySQL
from_unixtime(epoch

,
optional output format

)


The default output format is
YYY-MM-DD HH:MM:SS more
...

SQL Server
DATEADD(s,
epoch

, '1970-01-01 00:00:00')


Microsoft Excel
=(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 timezones: =((A1 +/- timezone adjustment) / 86400) + 25569.
JavaScriptuse the JavaScript
Date object

Unix/Linux
date
-d @1190000000


Replace 1190000000 with your epoch, needs recent
version of 'date'. Replace '-d' with '-ud' for GMT/UTC time.
Other OS'sCommand
line: 
perl -e "print scalar(localtime(epoch

))"


(If
Perl is installed) Replace 'localtime' with 'gmtime' for GMT/UTC time.
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