TBSync introduces zeroes in TZID when pushing to Exchange

[guillaume-perreal]

Your environment

TbSync version: 3.0.2 EAS-4-TbSync version: 2.0.1 Thunderbird version: 91.10.0 (64 bits) Exchange Server : 2010

Expected behavior

ICS exported from webcal links should not contain zeroes in TZID.

Actual behavior

ICS exported from webcal links does contain zeroes in TZID.

Steps to reproduce

• Using Exchange web client :
  • Create a test calendar,
  • Share it with an external address to get the webcal URL
  • Create an event in that calendar
• Check the generated ICS using curl and the webcal URL: it contains no zeroes,
• Fetch the event using TBSync,
• Edit the event in Thunderbird,
• Push the change to the server,
• Check the generated ICS using curl and the webcal URL: TZID are followed with zeroes,

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