List based on Article 11 of the European Convention of 16 May 1972 on the Calculation of Time-Limits (SR 0.221.122.3), abbreviated CETS No. 076

The list is up-to-date (excluding holidays that always fall on a Sunday):

• New Year's Day (January 1)
• Good Friday (Easter minus 2 days)
• Easter Monday (Easter plus 1 day)
• Fahrtsfest (always on the first Thursday in April)
• Ascension Day (Easter plus 39 days)
• Whit Monday (Easter plus 50 days)
• Swiss National Day (August 1)
• All Saints' Day (November 1)
• Christmas Day (December 25)
• Boxing Day (December 26)

The list mentions Berchtoldstag as a day treated like a public holiday. However, no legal basis can be found for this. In the judgment of the Glarus High Court OG.2017.00003 of January 25, 2021, it states: "In the Canton of Glarus, not only January 1 but also January 2 is a public holiday" (see https://www.swisslex.ch/de/doc/claw/9e62832f-20c2-4387-8beb-d0e4d3b071c3). However, the decision does not refer to the observance of an official or judicial deadline.

The Glarus post office is also closed on Berchtoldstag: https://www.local.ch/de/d/glarus/8750/post-filiale-8750-glarus-XZx2LRTkD4SVVbJTskzakg

If you want to be absolutely sure, it's best not to treat Berchtoldstag as a public holiday.

Art. 2 Para. 2 RTG/GL

Public holidays, except for Berchtoldstag, as listed in the CETS No. 076 list