Difference between revisions of "Convert between date and unix timestamp"

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=== Excel way: convert to date from unix timestamp ===
 
=== Excel way: convert to date from unix timestamp ===
 +
* [https://errerrors.blogspot.com/2019/09/how-to-convert-between-date-and-unix-timestamp-in-excel.html 怎樣轉換 Excel 日期時間成 Unix 時間戳記 (unix timestamp)]
 
* [https://www.extendoffice.com/documents/excel/2473-excel-timestamp-to-date.html How to convert between date and Unix timestamp in Excel?]
 
* [https://www.extendoffice.com/documents/excel/2473-excel-timestamp-to-date.html How to convert between date and Unix timestamp in Excel?]
* [https://docs.google.com/spreadsheets/d/1mUPLWLdCHcN5Nr3CL2JWYfdYmy4JyiYClXD1kHMLZc4/edit?usp=sharing demo]
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 +
timezone: UTC
 +
<pre>
 +
= (VALUE( date_time )-25569)*86400
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</pre>
  
 
=== Excel way: convert to unix timestamp from date ===
 
=== Excel way: convert to unix timestamp from date ===
 
input data (A2 cell): YYYY/MM/DD (e.g. {{CURRENTYEAR}}/{{CURRENTMONTH}}/{{CURRENTDAY2}} ) or YYYY/MM/DD HH:MM (e.g. {{CURRENTYEAR}}/{{CURRENTMONTH}}/{{CURRENTDAY2}} {{CURRENTTIME}}) {{kbd | key==(A2-DATE(1970,1,1))*86400}} <ref>[http://stackoverflow.com/questions/1703505/excel-date-to-unix-timestamp Excel date to Unix timestamp - Stack Overflow]</ref>
 
input data (A2 cell): YYYY/MM/DD (e.g. {{CURRENTYEAR}}/{{CURRENTMONTH}}/{{CURRENTDAY2}} ) or YYYY/MM/DD HH:MM (e.g. {{CURRENTYEAR}}/{{CURRENTMONTH}}/{{CURRENTDAY2}} {{CURRENTTIME}}) {{kbd | key==(A2-DATE(1970,1,1))*86400}} <ref>[http://stackoverflow.com/questions/1703505/excel-date-to-unix-timestamp Excel date to Unix timestamp - Stack Overflow]</ref>
 +
 +
timezone: UTC
 +
<pre>
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= TEXT( (Unixtime / 86400) + 25569, "YYYY-mm-dd hh:mm:ss")
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</pre>
  
 
== References ==
 
== References ==
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[[Category:Web_Dev]]
 
[[Category:Web_Dev]]
 
[[Category:MySQL]]
 
[[Category:MySQL]]
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[[Category:Excel]]
 
[[Category:Data Science]]
 
[[Category:Data Science]]
 
[[Category:Time river]]
 
[[Category:Time river]]

Latest revision as of 14:03, 9 September 2019

terms of time format[edit]

format \ date 1899/12/31 (1900/1/0) 1900/1/1 1970/1/1 2016/1/1 notes
value of unix timestamp
(the number of seconds since 1970/01/01[1])
-2209075200 -2208988800 0 1451606400
value of Excel DATEVALUE function or LibreOffice DATEVALUE function
(Excel: number of days since 1898/12/31)
0 1 25569 42370 5 digit numbers after 1970/1/1

Icon exclaim.gif VALUE() function on Excel is number of days since 1899/12/31. DATEVALUE of 1900/1/1 will return 1. VALUE() function on Google sheet is number of days since 1899/12/30 [Last visited: 2019-05-22]

Convert between date and unix timestamp[edit]

Online tool

// timestamp: 1552521600
// Is equivalent to:
// 03/14/2019 @ 12:00am (UTC)
// 2019-03-14T00:00:00+00:00 in ISO 8601
// Thu, 14 Mar 2019 00:00:00 +0000 in RFC 822, 1036, 1123, 2822
// Thursday, 14-Mar-19 00:00:00 UTC in RFC 2822
// 2019-03-14T00:00:00+00:00 in RFC 3339

PHP way: convert to date time from unix timestamp[edit]

Using the date() function & date_default_timezone_set

date_default_timezone_set('UTC');
$timestamp = 0;
echo date('Y-m-d H:i:s', $timestamp) . PHP_EOL; // 1970-01-01 00:00:00

date_default_timezone_set("Europe/London");
$timestamp = 1552521600;
echo date('Y-m-d H:i:s', $timestamp) . PHP_EOL; // 2019-03-14 00:00:00

date_default_timezone_set("Asia/Taipei");
$timestamp = 1552521600;
echo date('Y-m-d H:i:s', $timestamp) . PHP_EOL; // 2019-03-14 08:00:00

PHP way: convert to unix timestamp from date time[edit]

Using the strtotime() function

date_default_timezone_set("Europe/London");
echo strtotime('2019-03-14 00:00:00') . PHP_EOL; // 1552521600

date_default_timezone_set("Asia/Taipei");
echo strtotime('2019-03-14 08:00:00') . PHP_EOL; // 1552521600

Excel way: convert to date from unix timestamp[edit]

timezone: UTC

= (VALUE( date_time )-25569)*86400

Excel way: convert to unix timestamp from date[edit]

input data (A2 cell): YYYY/MM/DD (e.g. 2019/09/20 ) or YYYY/MM/DD HH:MM (e.g. 2019/09/20 11:40) =(A2-DATE(1970,1,1))*86400 [2]

timezone: UTC

= TEXT( (Unixtime / 86400) + 25569, "YYYY-mm-dd hh:mm:ss")

References[edit]