Hours of service
GST/HST electronic filing is available seven days a week during the following hours:
- Pacific time zone
3:00 am to 11:30 pm
- Mountain time zone
4:00 am to 12:30 am
- Central time zone
5:00 am to 1:30 am
- Eastern time zone
6:00 am to 2:30 am
- Atlantic time zone
7:00 am to 3:30 am
- Newfoundland time zone
7:30 am to 4:00 am
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