How to default the current time in the timestamp field of django models?

Field definition in model

    date_publish = models.IntegerField(verbose_name="" , default=0)

how do I set the default current timestamp?

Feb.26,2021

import datetime

date_publish = models.IntegerField (verbose_name= "update timestamp", default=datetime.datetime.now)

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7b2f6f-83cf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7b2f6f-83cf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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