Hi Jean! The valid days of the Swiss Pass are measured in dates, not hours. So a Swiss Pass first used on March 27, regardless of the exact time, is valid up to and including March 30. If you need 5 days to be covered and like traveling in 1st class, this offer might just be what you're looking for. If not, you can best consider the Swiss Half Fare Card or Swiss Card mentioned in this post.
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Swiss Travel Pass promotion 25% discountOnly if purchased in July 2021. Free cancellation.Buy via the SBB travel centre at https://shop.switzerlandtravelcentre.com or HappyRail at https://www.happyrail.com/swiss-travel-pass.