What difference between the DATE TIME DATETIME and TIMESTAMP Types

Question

I need to store both time and date in the mysql  So I used of NOW   function for that  But I don t know what should I use for type column im phpmyadmin  It should be noted that NOW   returns both time and date like this   2014-11-11 12 45 34   Here is a solution  I can use of a separator for separating date and time  2014-11-11 and 12 45 34  and then store them in the DATE type and TIME type individually  Or I can use of VARCHAR type for storing both of them in one column  But I think these ways are not standard  what is standard type for storing both date and time    Here is my query   also I don t know why NOW   function does not works   INSERT INTO table  timedate  VALUES  NOW

User · Answer

Saty described the differences between them. For your practice, you can use datetime in order to keep the output of NOW().

For example:

CREATE TABLE Orders
(
  OrderId int NOT NULL,
  ProductName varchar(50) NOT NULL,
  OrderDate datetime NOT NULL DEFAULT NOW(),
  PRIMARY KEY (OrderId)
)

You can read more at w3schools.

User · Answer

DATE  It is used for values with a date part but no time part  MySQL retrieves and displays DATE values in YYYY-MM-DD format  The supported range is 1000-01-01 to 9999-12-31   DATETIME  It is used for values that contain both date and time parts  MySQL retrieves and displays DATETIME values in YYYY-MM-DD HH MM SS format  The supported range is 1000-01-01 00 00 00 to 9999-12-31 23 59 59   TIMESTAMP  It is also used for values that contain both date and time parts  and includes the time zone  TIMESTAMP has a range of 1970-01-01 00 00 01 UTC to 2038-01-19 03 14 07 UTC   TIME  Its values are in HH MM SS format  or HHH MM SS format for large hours values   TIME values may range from -838 59 59 to 838 59 59  The hours part may be so large because the TIME type can be used not only to represent a time of day  which must be less than 24 hours   but also elapsed time or a time interval between two events  which may be much greater than 24 hours  or even negative

User · Answer

I have a slightly different perspective on the difference between a DATETIME and a TIMESTAMP  A DATETIME stores a literal value of a date and time with no reference to any particular timezone  So  I can set a DATETIME column to a value such as  2019-01-16 12 15 00  to indicate precisely when my last birthday occurred  Was this Eastern Standard Time  Pacific Standard Time  Who knows  Where the current session time zone of the server comes into play occurs when you set a DATETIME column to some value such as NOW    The value stored will be the current date and time using the current session time zone in effect  But once a DATETIME column has been set  it will display the same regardless of what the current session time zone is   A TIMESTAMP column on the other hand takes the  2019-01-16 12 15 00  value you are setting into it and interprets it in the current session time zone to compute an internal representation relative to 1 1 1970 00 00 00 UTC  When the column is displayed  it will be converted back for display based on whatever the current session time zone is  It s a useful fiction to think of a TIMESTAMP as taking the value you are setting and converting it from the current session time zone to UTC for storing and then converting it back to the current session time zone for displaying   If my server is in San Francisco but I am running an event in New York that starts on 9 1 1029 at 20 00  I would use a TIMESTAMP column for holding the start time  set the session time zone to  America New York  and set the start time to  2009-09-01 20 00 00   If I want to know whether the event has occurred or not  regardless of the current session time zone setting I can compare the start time with NOW    Of course  for displaying in a meaningful way to a perspective customer  I would need to set the correct session time zone  If I did not need to do time comparisons  then I would probably be better off just using a DATETIME column  which will display correctly  with an implied EST time zone  regardless of what the current session time zone is   TIMESTAMP LIMITATION  The TIMESTAMP type has a range of  1970-01-01 00 00 01  UTC to  2038-01-19 03 14 07  UTC and so it may not usable for your particular application  In that case you will have to use a DATETIME type  You will  of course  always have to be concerned that the current session time zone is set properly whenever you are using this type with date functions such as NOW

[mysql] What difference between the DATE, TIME, DATETIME, and TIMESTAMP Types

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