1 files changed, 86 insertions, 0 deletions
diff --git a/docs/docs/modifiers.md b/docs/docs/modifiers.md
new file mode 100644
index 0000000..b440587
--- /dev/null
+++ b/docs/docs/modifiers.md
@@ -0,0 +1,86 @@
+# Modifiers
+
+This group of methods performs helpful modifications to a copy of the current instance.
+You'll notice that the `start_of()`, `next()` and `previous()` methods
+set the time to `00:00:00` and the `end_of()` methods set the time to `23:59:59.999999`.
+
+The only one slightly different is the `average()` method.
+It returns the middle date between itself and the provided `DateTime` argument.
+
+```python
+>>> import pendulum
+
+>>> dt = pendulum.datetime(2012, 1, 31, 12, 0, 0)
+
+>>> dt.start_of('day')
+'2012-01-31 00:00:00'
+
+>>> dt.end_of('day')
+'2012-01-31 23:59:59'
+
+>>> dt.start_of('month')
+'2012-01-01 00:00:00'
+
+>>> dt.end_of('month')
+'2012-01-31 23:59:59'
+
+>>> dt.start_of('year')
+'2012-01-01 00:00:00'
+
+>>> dt.end_of('year')
+'2012-12-31 23:59:59'
+
+>>> dt.start_of('decade')
+'2010-01-01 00:00:00'
+
+>>> dt.end_of('decade')
+'2019-12-31 23:59:59'
+
+>>> dt.start_of('century')
+'2000-01-01 00:00:00'
+
+>>> dt.end_of('century')
+'2099-12-31 23:59:59'
+
+>>> dt.start_of('week')
+'2012-01-30 00:00:00'
+>>> dt.day_of_week == pendulum.MONDAY
+True # ISO8601 week starts on Monday
+
+>>> dt.end_of('week')
+'2012-02-05 23:59:59'
+>>> dt.day_of_week == pendulum.SUNDAY
+True # ISO8601 week ends on SUNDAY
+
+>>> dt.next(pendulum.WEDNESDAY)
+'2012-02-01 00:00:00'
+>>> dt.day_of_week == pendulum.WEDNESDAY
+True
+
+>>> dt = pendulum.datetime(2012, 1, 1, 12, 0, 0)
+dt.next()
+'2012-01-08 00:00:00'
+>>> dt.next(keep_time=True)
+'2012-01-08T12:00:00+00:00'
+
+>>> dt = pendulum.datetime(2012, 1, 31, 12, 0, 0)
+>>> dt.previous(pendulum.WEDNESDAY)
+'2012-01-25 00:00:00'
+>>> dt.day_of_week == pendulum.WEDNESDAY
+True
+
+>>> dt = pendulum.datetime(2012, 1, 1, 12, 0, 0)
+>>> dt.previous()
+'2011-12-25 00:00:00'
+>>> dt.previous(keep_time=True)
+'2011-12-25 12:00:00'
+
+>>> start = pendulum.datetime(2014, 1, 1)
+>>> end = pendulum.datetime(2014, 1, 30)
+>>> start.average(end)
+'2014-01-15 12:00:00'
+
+# others that are defined that are similar
+# and tha accept month, quarter and year units
+# first_of(), last_of(), nth_of()
+```