how to check booking period is over from current date - php

Question

I'm having trouble to determine whether booking period is over or not?
i have 2 unix timestamp like this start =>2017-06-20 12:00:00 and End => 2017-06-23 12:00:00
on each time the query is run i want to check whether time is elapsed or not (i,e booking period is reached or not) from my current date (which i can pass using php)
my pseudo code:
select timestampdiff(DAY, '2017-06-20 12:00:00', '2017-06-23 12:00:00'); returns 3
returnedDate = 3; // returns difference either in date format or no.of days
if((returnedDate - mycurrentDate) == 0){
//your booking period is over
}else{
// no of remaining days
}
Desired Solution: i'm looking for mysql specific solution, good php solution is also welcomed.
Question: how to know the pre-booking date is expired?
please help me to solve this, thanks in advance!!!

Answer 1

Assuming mycurrentDate is NOW(), start and end are the dates in which the event occurs, and the threshold for booking is the end date.
You could use DATEDIFF to determine the number of days remaining until the event ends and check if the end date has already passed for the event to show 0.
EG: How many days until the event(s) ends
Demo: http://sqlfiddle.com/#!9/95b548/2
Assuming NOW() is 2017-06-21 12:00:00 using a past, current, and a future events.
| id | start | end |
|----|---------------------|---------------------|
| 1 | 2017-06-20T12:00:00 | 2017-06-23T12:00:00 | #current
| 2 | 2017-06-01T12:00:00 | 2017-06-03T12:00:00 | #past
| 3 | 2017-07-01T12:00:00 | 2017-07-03T12:00:00 | #future
SELECT
id,
NOW() AS `current_date`,
`tn`.`start` AS `starts_on`,
`tn`.`end` AS `ends_on`,
IF(`tn`.`end` >= NOW(),
DATEDIFF(`tn`.`end`, NOW()), #show days until event ends
0 #the event has already passed
) AS `days_remaining`
FROM `table_name` AS `tn`
Results:
| id | current_date | start | end | days_remaining |
|----|---------------------|------------------------|------------------------|----------------|
| 1 | 2017-06-21T12:00:00 | June, 20 2017 12:00:00 | June, 23 2017 12:00:00 | 2 |
| 2 | 2017-06-21T12:00:00 | June, 01 2017 12:00:00 | June, 03 2017 12:00:00 | 0 |
| 3 | 2017-06-21T12:00:00 | July, 01 2017 12:00:00 | July, 03 2017 12:00:00 | 12 |
If end is stored as a unix timestamp, you can use FROM_UNIXTIME() to convert it to a DATETIME value:
IF(FROM_UNIXTIME(`tn`.`end`) >= NOW(),
DATEDIFF(FROM_UNIXTIME(`tn`.`end`), NOW()),
0
) AS `days_remaining`