It's probably not obvious in my fics, but I do not use the official Earth-to-Cybertronian time conversions. It's not obvious because the changes are very minor, and this is my attempt to explain why I don't use the official conversions.
Before I get started, I need to explain that, in my headcanon, Transformers use base 16 to count instead of our base 10. Base 16, also called hexidecimal or 'hex', is primarily used as a human-friendly representation of binary code. Transformers are computers, in a manner of speaking, and so they might well run off binary, but that gets very difficult for counting. I chose hex because it's simpler. Now, as for what 'base 16' means, I'll explain it this way. In English, we count 'zero, one, two, three, four, five, six, seven, eight, nine,' and then ten is a new column. That's 'base 10', because there's ten single digit numbers. Each step after that is, again, ten numbers. 10-19, 20-29, ect. In base 16, there are sixteen single digit numbers