*Last updated: 2023-03-16.*
# tf_quant_finance.datetime.utils.days_in_leap_and_nonleap_years_between
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Calculates number of days that fall on leap and non-leap years.
```python
tf_quant_finance.datetime.utils.days_in_leap_and_nonleap_years_between(
start_date, end_date
)
```
Calculates a tuple '(days_in_leap_years, days_in_nonleap_years)'.
'start_date' is included and 'end_date' is excluded from the period.
For example, for dates `2019-12-24` and `2024-2-10` the result is
(406, 1103):
406 = 366 days in 2020 + 31 in Jan 2024 + 9 in Feb 2024,
1103 = 8 in 2019 + 365 in 2021 + 365 in 2022 + 365 in 2023.
If `end_date` is earlier than `start_date`, the result will be negative or
zero.
#### Args:
* `start_date`: DateTensor.
* `end_date`: DateTensor compatible with `start_date`.
#### Returns:
Tuple of two Tensors of type 'int32'.