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Linux bash get timestamp date -d @1482073199

[Link refer here]

Dùng hàm date trên linux để lấy ra time dạng UNIX. Ngược lại tính ngày từ UNIX time
date +"%s" hay date +"%D" để lấy time.

Tính ngược ngày từ timestamp:
nickfarow:src$ date -d @1482073199
Chủ nhật, 18 Tháng mười hai năm 2016 21:59:59 ICT

Rảnh thì viết 1 bash để tính tự động (ít gõ lệnh hơn)

nickfarow:src$ cat ~/bin/timestamp.sh
#!/bin/bash

# Define a timestamp function
timestamp() {
  date +"%T"
}

datetime() {
  date +"%D"
}
# TODO use variable

# do something...
timestamp # print timestamp
# do something else...
datetime # print another timestamp
# continue...

timestamp2() {
  date +"%s"
}

timestamp2


Run:

nickfarow:src$ ~/bin/timestamp.sh
14:19:45
06/24/16
1466752785

Update 1 2016/07/12
https://blog.serverdensity.com/handling-timezone-conversion-with-php-datetime/


$date = new DateTime(null, new DateTimeZone(date_default_timezone_get())); // Because we call this function using GTM time (UTC)
$now = $date->getTimeStamp() + $date->getOffset();
print_r('to '. $date->getTimeStamp() . ' offset '. $date->getOffset(). '<br/>');

VD h JST set cho apache thì offset là 9h ~ 32400s
Giờ ICT là IndoChina Time +07
$date->getTimeStamp()  vẫn in ra theo h hiện tại của hệ thống (UNIX) tương tự khi chạy hàm date +"%s" trên bash.
Apache có thể tùy biến timezone thì phải, cho nên offset có thể khác so với timezone UNIX.
Ví dụ trên PHP (apache) offset là 9h, còn thực tế là 7h.
Mà cái $date->getTimeStamp() hơi nhì nhằng (tưởng nó lấy h UTC +0) rồi thêm offset mà nó lại lấy luôn h System ra (+XX).


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