Datum & Tijd (MySQL): verschil tussen versies

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(Unix Time - from_unixtime())
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* https://en.wikipedia.org/wiki/Unix_time
 
* https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html
 
* https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html
 
* http://stackoverflow.com/questions/10763031/how-to-subtract-30-days-from-the-current-datetime-in-mysql
 
* http://stackoverflow.com/questions/10763031/how-to-subtract-30-days-from-the-current-datetime-in-mysql
 
* https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-add
 
* https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-add

Versie van 13 aug 2018 om 16:36

Timestamps

Bv.:

select date_format(now(),"%Y%m%d_%H%i");
20180724_1124

Meer:

select now();						-- 2017-04-28 17:17:02
select date_format(now(),"%m");         		-- 04
select date_format(now(),'%m');         		-- 04
select date_format(now(),"%d");         		-- 28
select date_format(now(),"%m/%d/%y");   		-- 04/28/17
select date_format(now(),"%m/%d/%Y");   		-- 04/28/2017
select date_format(now(),"%m-%d-%Y");   		-- 04-28/2017
select date_format(now(),"%m/%d/%Y")+50;   		-- 54 → Dit werkt dus niet
select date_format(now()+50,"%m/%d/%Y");		-- Null
select now()+interval 50 day;				-- 2017-06-17 17:18:53
select date_format(now()+interval 90 day,"%m/%d/%Y");	-- 07/27/2017


Unix Time - from_unixtime()

Met from_unixtime() kun je Unix tijdwaardes leesbaar formatteren. Bv.:

select from_unixtime(1453991397);   # Output: 2016-01-28 15:29:57

Unix Time - unix_timestamp()

Met unix_timestamp() converteer je een datum of tijd in een leesbaar formaat terug naar Unix Time:

select unix_timestamp(now());                   # Output: 2016-02-17 16:41:39
select unix_timestamp("Oct. 19, 2015");         # Output: 0
select unix_timestamp("2015-10-19");            # Output: 1445205600
select unix_timestamp("2011-07-11 07:50:51");   # Output: 1310363451
select unix_timestamp("2011-07-11");            # Output: 1310335200
select unix_timestamp("2011-07");               # Output: 0

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