Which th second now in this year In this challenge you have to find out which nth second it is now in this year, current date and time now. Or in other words, how many seconds have passed since New Year.
An example current Date is (it's not given, you'll have to find the current Date):
March 5, 2021 1:42:44 AM

For which the answer is 5449364 (or optionally 5449365 if you count January 1, 2021 0:00:00 as the first second).
So you should return or output which 'th second it is now in this year. Standard loopholes apply, shortest code wins. You may keep fractional seconds in output optionally.
Python 2, 55 bytes

from time import*
k=86400
print~-gmtime()[7]*k+time()%k

Try it online!
-4 bytes thanks to Wasif
-11 bytes thanks to dingledooper