Utc to local time linux

Bash: get date and time from another time zone

I would want to get the date and time from another time zone (UTC-4) with a bash command, but I don’t want to configure it as the default TZ for the system.
Is there a simple way to do it?
E.g 1 (current):

$ date fri nov 7 13:15:35 UTC 2014 
$ date (+ some option for UTC-4) fri nov 7 09:15:35 UTC 2014 

4 Answers 4

or if you want to do date arithmetic you could use

But it requires you to know the proper name of the time zone you want, which can be tricky to find out sometimes. You can also use a numeric offset, though it’s by no means obvious how. The timezone(3) manual page has the gory details.

Also maybe check Wikipedia to find e.g. that TZ=Asia/Kolkata is one way to get IST (which is tricky because TZ=UTC-5:30 isn’t entirely obvious; e.g. UTC-5.5 doesn’t work).

Any way this could be achieved for macOS? -d argument is for daylight saving offset in the date tool and there is no argument for date string.

You can use offset value in TZ to get the date for a different timezone:

TZ=UTC date -R Fri, 07 Nov 2014 13:55:07 +0000 TZ=UTC+4 date -R Fri, 07 Nov 2014 09:54:52 -0400 

Yes that is how TZ works with offset. I would suggest using offset since it doesn’t require you to remember long & valid timezone names.

You don’t need a subshell. TZ=UTC date sets TZ , runs date , and reverts the value of TZ to its previous value (unset, or different value, or the same value as the one you specified, as the case may be).

Also, TZ=UTC-4 date confusingly prints the time zone as «UTC» even though it’s not. (This is visible in your example output, too.)

The TZ=UTC date -R is the only solution I could get to work that works on Mac OS for a redis set key insert I am doing and wanted UTC: redis-cli set starttime «$(TZ=UTC date -R)»

I use a little script for that, so I don’t have to know or remember the exact name of the timezone I’m looking for. The script takes a search string as argument, and gives the date and time for any timezone matching the search. I named it wdate .

#!/bin/bash # Show date and time in other time zones search=$1 format='%a %F %T %z' zoneinfo=/usr/share/zoneinfo/posix/ if command -v timedatectl >/dev/null; then tzlist=$(timedatectl list-timezones) else tzlist=$(find -L $zoneinfo -type f -printf "%P\n") fi grep -i "$search"  
$ wdate fax America/Halifax Fri 2022-03-25 09:59:02 -0300 
$ wdate canad Canada/Atlantic Fri 2022-03-25 10:00:04 -0300 Canada/Central Fri 2022-03-25 08:00:04 -0500 Canada/Eastern Fri 2022-03-25 09:00:04 -0400 Canada/Mountain Fri 2022-03-25 07:00:04 -0600 Canada/Newfoundland Fri 2022-03-25 10:30:04 -0230 Canada/Pacific Fri 2022-03-25 06:00:04 -0700 Canada/Saskatchewan Fri 2022-03-25 07:00:04 -0600 Canada/Yukon Fri 2022-03-25 06:00:04 -0700 

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Linux change utc to local time code example

Solution 2: Userspace can call to pass local time and timezone into the kernel. The kernel mainly uses to return local time back to userspace through etc., and there are a few places like that want to use the timezone too.

Linux time_to_tm and local time

The kernel doesn't know or care about timezones or DST, everything it does is in terms of seconds since the epoch. Timezones and DST are handled by libraries in user mode, which check your environment variables and can scan the timezone files.

This function is not callable by the end user -- there's no system call interface to it. It's just used internally within the kernel. If you look in the cross-reference (http://lxr.free-electrons.com/ident?v=2.6.33;i=time_to_tm), the only place it's currently called from is the FAT filesystem driver. It is indeed used to adjust for timezone; it was done to support the tzoff mount option.

Userspace can call settimeofday() to pass local time and timezone into the kernel. The timezone is stored in sys_tz (see do_sys_settimeofday() in kernel/time.c ). The kernel mainly uses sys_tz to return local time back to userspace through gettimeofday() etc., and there are a few places like fs/fat that want to use the timezone too.

C++ Equivalent for GetLocalTime in Linux (with, You can use a combination of: clock_gettime (CLOCK_REALTIME); returns local time, up to millisecond (of course constrained by the actual clock resolution); does not care of local timezone information, returns UTC time. Just use millisecond information (from tv_nsec field).

I would avoid the offset approach and specify your target timezone directly. For example to convert a date to Hong Kong time using GNU date :

$ TZ='Asia/Hong_Kong' date -d 'Sat Mar 15 01:30:01 UTC 2014' Sat Mar 15 09:30:01 HKT 2014 

TZ is the time zone variable. The -d option to date tells it to read the time from the specified string.

If you don't specify TZ , you will get your computer's default time zone:

$ date -d 'Sat Mar 15 01:30:01 UTC 2014' Fri Mar 14 18:30:01 PDT 2014 

A list of timezones by country is here.

This approach is not applicable to Mac OSX (BSD) version of date for which -d does something else.

In [1]: import datetime In [2]: utcstring = 'Sat Mar 15 01:30:01 UTC 2014' In [3]: offsetstring = '2:00' 

Now parsing the two strings

In [4]: utc = datetime.datetime.strptime(utcstring, '%a %b %d %H:%M:%S %Z %Y') In [5]: offset = datetime.datetime.strptime(offsetstring, '%H:%M') 

delta is computed by timedelta . we can add/subtract datetime using this delta

In [6]: delta = datetime.timedelta(hours=offset.hour, minutes=offset.minute) 
In [7]: utc + delta Out[7]: datetime.datetime(2014, 3, 15, 3, 30, 1) 

This can be converted to string back as

In [9]: datetime.datetime.strftime(utc + delta, '%a %b %d %H:%M:%S %Y') Out[9]: 'Sat Mar 15 03:30:01 2014' 

For more detail, see: https://docs.python.org/2.7/library/datetime.html

How can I have `date` output the time from a different, The offset is added to the local time to obtain UTC (formerly known as GMT). The start and end time fields indicate when the standard/daylight transitions occur. For example, in the Eastern United States, standard time is 5-hours earlier than UTC, and we can specify EST5EDT in lieu of America/New_York. These alternatives …

How to get the current time and date C++ UTC time not local

You are looking for the gmtime function in the time.h library, which give you UTC time. Here's an example:

#include /* printf */ #include /* time_t, struct tm, time, gmtime */ int main () < time_t rawtime; struct tm * ptm; // Get number of seconds since 00:00 UTC Jan, 1, 1970 and store in rawtime time ( &rawtime ); // UTC struct tm ptm = gmtime ( &rawtime ); // print current time in a formatted way printf ("UTC time: %2d:%02d\n", ptm->tm_hour, ptm->tm_min); return 0; > 

How to convert from UTC to local time in C?, convert it to a time_t using mktime. time_t utc = mktime ( &date ); then convert it to local time. time_t local = utc - timezone + ( daylight?3600:0 ); timezone is the number of seconds away from utc for the current timezone and daylight is 1 to indicate daylight savings time is in play and zero for not.

C program delivers only the UTC time as localtime on Linux using GCC

I finally figured out, that the problem was the libc.so library, which was differently compiled for one of the machines and only used for some C applications excepting linux himself. This explains why date delivers the wright output but the C program not. Using ldd libc.so I've found out that the linker was also set to be at the path /home/mqm/lib as default, which dosn't fit to my server /home/mqm/lib/lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 . To resume, here is the full solution:

Problem : Your Linux system is delivering the wright date and time using date or some applications but wrong output using C programs.

Solution : After ensuring that there is no programming error in your code, check with

strace -e trace=open,close,read,write,connect,accept yourCProgram

which path is used to get the time/timezone. You can also check ldd libc.so to see where the default path of the linker is. If the paths are not corresponding to your linux system configuration, consider recompiling the C library to fit to your system configuration or set $TZ='fullpathtotimezone' as a hotfix / workaround.

Convert UTC datetime string to local datetime, from datetime import datetime import time def datetime_from_utc_to_local(utc_datetime): now_timestamp = time.time() offset = datetime.fromtimestamp(now_timestamp) - datetime.utcfromtimestamp(now_timestamp) return utc_datetime + offset This avoids the timing issues in DelboyJay's example. And the lesser timing issues in Erik van Oosten's amendment. Code samplefrom_zone = tz.tzutc()to_zone = tz.tzlocal()utc = datetime.strptime('2011-01-21 02:37:21', '%Y-%m-%d %H:%M:%S')utc = utc.replace(tzinfo=from_zone)central = utc.astimezone(to_zone)Feedback

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⏲️ Преобразование даты и времени utc в локальное время на Linux

Команда date в Linux способна конвертировать дату и время из UTC в локальное время вашей системы.

Также можно сделать обратное и преобразовать местное время в UTC с помощью команды date.

В этом руководстве мы покажем, как конвертировать дату и время UTC в локальное время в командной строке Linux.

Вы также увидите, как конвертировать в другие различные часовые пояса.

Преобразование UTC в локальное время

В приведенных ниже примерах показано, как использовать команду date для преобразования между UTC и другими часовыми поясами.

Запомните, что ваш местный часовой пояс всегда можно узнать с помощью следующей команды.

$ ls -l /etc/localtime lrwxrwxrwx 1 root root 36 Mar 9 2021 /etc/localtime -> /usr/share/zoneinfo/America/New_York

В приведенном ниже примере мы преобразуем время UTC в локальное время (EDT, в данном случае).

$ date -d '2014-06-26 23:00 UTC' Thu 26 Jun 2014 07:00:00 PM EDT

Вы также можете указать время само по себе, без даты.

$ date -d '23:00 UTC' Sun 10 Oct 2021 07:00:00 PM EDT

Вы также можете конвертировать время из других часовых поясов.

Например, эта команда преобразует время из CEST (центрально-европейское летнее время) в местное время.

$ date -d '2021-06-26 23:00 CEST' Sat 26 Jun 2021 05:00:00 PM EDT

Преобразование между UTC или другим часовым поясом и вашим местным часовым поясом очень легко выполняется с помощью команды date.

Чтобы узнать, что еще можно сделать с помощью этой команды, ознакомьтесь с нашим полным руководством по команде date.

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