Standard time in Kazakhstan is either UTC+05:00 or UTC+06:00. These times apply throughout the year as Kazakhstan does not observe Daylight saving time.
Contents
IANA time zone database
The IANA time zone database identifies five zones for Kazakhstan. Data in columns marked * are from the file zone.tab of the database.
According to an email on the tz mailing list, Kostanay Province could be part of Asia/Qyzylorda [1].
Time by region
Notes:
References
Time in Kazakhstan Wikipedia(Text) CC BY-SA