How to convert datetime.datetime to datetime.date? - mysql

Question

From my sql query I'm getting output as datetime.datetime(2020, 9, 22, 0, 0)
query = '''SELECT checkin_date FROM `table1`
WHERE checkin_date BETWEEN %s AND %s'''
cursor.execute(query,(startDate, endDate)
results = cursor.fetchall()
#results:
#[(datetime.datetime(2020, 9, 22, 0, 0), datetime.datetime(2020, 9, 24, 0, 0))]
for res in results:
## When I print type I get correct result
print(type(res[0]) ## <type 'datetime.datetime'>
##when I compare with another datetime.date (currentDate variable)
if res[0] < currentDate:
## I get error `TypeError: can't compare datetime.datetime to datetime.date` *which is expected*
## But when I use .date()
if res[0].date() < currentDate:
## I get `TypeError: can't compare datetime.date to unicode`
I tried converting currentDate to datetime.datetime, but still doesn't work. Can't seem to figure out what's the issue here.

Answer 1

To force your query to spit out the date format you want, change it to this:
SELECT DATE_FORMAT(checkin_date, '%Y-%c-%d')
FROM table1
WHERE DATE(checkin_date) BETWEEN %s AND %s
To make it able to use an index on your checkin_date column, change it to this.
SELECT DATE_FORMAT(checkin_date, '%Y-%c-%d')
FROM table1
WHERE checkin_date >= DATE(%s)
AND checkin_date < DATE(%s) + INTERVAL 1 DAY

Answer 2

Try this
splitting a datetime column into year, month and week
SELECT Year(checkin_date), Month(Checkin_date), Day(Checkin_date),
FORMAT(GETDATE(),'HH'), FORMAT(GETDATE(),'mm')
FROM table1
WHERE (CAST(checkin_date AS DATE) BETWEEN '2018-01-01' AND '2020-01-01')
Note: Use 'HH' for 24 hours format and 'hh' for 12.