Began 18 February 2007 · 354 days long
2007: year of the Fire
The year started on 18 February, not on 1 January — so anyone born in 2007 before that date is a .
If you were born in 2007
Born on or after 18 February — you are the Fire . Born between 1 January and 17 February — you are a , and every calculator that asked only for your birth year has been telling you otherwise. That is 48 days of 2007 assigned to the wrong animal by the usual method.
The across the cycle
The animal returns every 12 years but the element every 60, so each of these years is a different .
Lunar years around 2007
Lengths differ because a leap month is inserted every two or three years. This is what makes the new year date jump rather than drift.
Why 354 days, and not 365
The Chinese calendar counts lunar months of about 29.53 days. Twelve of them come to roughly 354 days, eleven short of a solar year, so a thirteenth month is inserted every two or three years to keep the calendar aligned with the seasons. At 354 days, 2007 was an ordinary year of 12 lunar months.
This is also why the new year date jumps around instead of drifting steadily: it moves back about eleven days each ordinary year, then forward by roughly nineteen when the leap month arrives.