$Timestamp is a decimal representation of the number of seconds since
1
970-01-01 00:00:00 UTC, normalized so that:
* there is always an integer and a fractional part,"the git way"
ie. separated by a dot
* the integer part should be a single '0' if it is zero,
and not have leading zeros otherwise
* the fractional part should be a single '0' if it is zero,
and not have trailing zeros otherwise no leading 0 unless the integer part is zero, always a dot, no trailing zero);
nd at most six digits in the decimal part.