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diff --git a/pendulum/constants.py b/pendulum/constants.py
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+# The day constants
+SUNDAY = 0
+MONDAY = 1
+TUESDAY = 2
+WEDNESDAY = 3
+THURSDAY = 4
+FRIDAY = 5
+SATURDAY = 6
+
+# Number of X in Y.
+YEARS_PER_CENTURY = 100
+YEARS_PER_DECADE = 10
+MONTHS_PER_YEAR = 12
+WEEKS_PER_YEAR = 52
+DAYS_PER_WEEK = 7
+HOURS_PER_DAY = 24
+MINUTES_PER_HOUR = 60
+SECONDS_PER_MINUTE = 60
+SECONDS_PER_HOUR = MINUTES_PER_HOUR * SECONDS_PER_MINUTE
+SECONDS_PER_DAY = HOURS_PER_DAY * SECONDS_PER_HOUR
+US_PER_SECOND = 1000000
+
+# Formats
+ATOM = "YYYY-MM-DDTHH:mm:ssZ"
+COOKIE = "dddd, DD-MMM-YYYY HH:mm:ss zz"
+ISO8601 = "YYYY-MM-DDTHH:mm:ssZ"
+ISO8601_EXTENDED = "YYYY-MM-DDTHH:mm:ss.SSSSSSZ"
+RFC822 = "ddd, DD MMM YY HH:mm:ss ZZ"
+RFC850 = "dddd, DD-MMM-YY HH:mm:ss zz"
+RFC1036 = "ddd, DD MMM YY HH:mm:ss ZZ"
+RFC1123 = "ddd, DD MMM YYYY HH:mm:ss ZZ"
+RFC2822 = "ddd, DD MMM YYYY HH:mm:ss ZZ"
+RFC3339 = ISO8601
+RFC3339_EXTENDED = ISO8601_EXTENDED
+RSS = "ddd, DD MMM YYYY HH:mm:ss ZZ"
+W3C = ISO8601
+
+
+EPOCH_YEAR = 1970
+
+DAYS_PER_N_YEAR = 365
+DAYS_PER_L_YEAR = 366
+
+USECS_PER_SEC = 1000000
+
+SECS_PER_MIN = 60
+SECS_PER_HOUR = 60 * SECS_PER_MIN
+SECS_PER_DAY = SECS_PER_HOUR * 24
+
+# 400-year chunks always have 146097 days (20871 weeks).
+SECS_PER_400_YEARS = 146097 * SECS_PER_DAY
+
+# The number of seconds in an aligned 100-year chunk, for those that
+# do not begin with a leap year and those that do respectively.
+SECS_PER_100_YEARS = (
+    (76 * DAYS_PER_N_YEAR + 24 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
+    (75 * DAYS_PER_N_YEAR + 25 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
+)
+
+# The number of seconds in an aligned 4-year chunk, for those that
+# do not begin with a leap year and those that do respectively.
+SECS_PER_4_YEARS = (
+    (4 * DAYS_PER_N_YEAR + 0 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
+    (3 * DAYS_PER_N_YEAR + 1 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
+)
+
+# The number of seconds in non-leap and leap years respectively.
+SECS_PER_YEAR = (DAYS_PER_N_YEAR * SECS_PER_DAY, DAYS_PER_L_YEAR * SECS_PER_DAY)
+
+DAYS_PER_YEAR = (DAYS_PER_N_YEAR, DAYS_PER_L_YEAR)
+
+# The month lengths in non-leap and leap years respectively.
+DAYS_PER_MONTHS = (
+    (-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
+    (-1, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
+)
+
+# The day offsets of the beginning of each (1-based) month in non-leap
+# and leap years respectively.
+# For example, in a leap year there are 335 days before December.
+MONTHS_OFFSETS = (
+    (-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365),
+    (-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366),
+)
+
+DAY_OF_WEEK_TABLE = (0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4)
+
+TM_SUNDAY = 0
+TM_MONDAY = 1
+TM_TUESDAY = 2
+TM_WEDNESDAY = 3
+TM_THURSDAY = 4
+TM_FRIDAY = 5
+TM_SATURDAY = 6
+
+TM_JANUARY = 0
+TM_FEBRUARY = 1
+TM_MARCH = 2
+TM_APRIL = 3
+TM_MAY = 4
+TM_JUNE = 5
+TM_JULY = 6
+TM_AUGUST = 7
+TM_SEPTEMBER = 8
+TM_OCTOBER = 9
+TM_NOVEMBER = 10
+TM_DECEMBER = 11