How does js get the timestamp of 16:00:00 on the 28th of this quarter?

how does js get the timestamp of 16:00:00 on the 28th of this quarter?

Apr.27,2021

does the 28th of the quarter exist? I still want to know when the 28th of this century is.


Quarterly knowledge of popular science is never needed.

from Baidu encyclopedia

commonly known as "br", a year is divided into four parts on average. According to the order of spring, summer, autumn and winter, < quarter > a year can be divided into four quarters, each lasting three months.
first quarter: January-March
second quarter: April-June
third quarter: July-September
fourth quarter: October-December
but in fact, the strict division should be: (according to Chinese latitude)
first quarter: March-May (spring)
second quarter: June-August (summer)
third quarter: September-November (autumn)
fourth quarter: December-February (winter)


the question should be changed to the time stamp of 16:00 on the 28th of the last month of the current quarter

  

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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-64f5-1e50f0f-450ec.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e50f0f-450ec.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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