Article 5JF1B Explain ical DTSTART in VTIMEZONE section

Explain ical DTSTART in VTIMEZONE section

by
mfoley
from LinuxQuestions.org on (#5JF1B)
At the beginning of an ics file there is a VTIMEZONE component, with a DTSTART property. The value of this property seems odd. For Thunderbird it is 19700308T020000. For Outlook it is 16010101T020000, which are 3/8/1970 2:00AM, and 1/1/1601 2:00AM, respectively.

Why are these dates set to such odd values? What is the significance of them being so widely different (by 369 years)?

I've checked the RFC https://datatracker.ietf.org/doc/html/rfc5545 and find nothing illuminating this.

Does anyone have an idea?latest?d=yIl2AUoC8zA latest?i=LZ_2COjN3UQ:0db6RtbHtoQ:F7zBnMy latest?i=LZ_2COjN3UQ:0db6RtbHtoQ:V_sGLiP latest?d=qj6IDK7rITs latest?i=LZ_2COjN3UQ:0db6RtbHtoQ:gIN9vFwLZ_2COjN3UQ
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