UTC
possibilities
'''
2 BC
1 BC
1 AD
2 AD
'''
leaps
'''
Every four years
except if divisible by
Leap Years:
2000
2004
Not Leap Years:
1900
1800
1700
'''
def is_leap_year (year):
if (year % 4 != 0):
return false;
'''
2000 -> Yes
1900 -> No
1800 -> No
1700 -> No
1600 -> Yes
Divisble by 100, but not divisible by 400 -> not a leap year
'''
if (year % 100 == 0 && year % 400 != 0):
return false
return true;
def is_leap_second ():
return;