*Last updated: 2023-03-16.*
# tf_quant_finance.datetime.utils.days_in_leap_years_between
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Calculates number of days between two dates that fall on leap years.
```python
tf_quant_finance.datetime.utils.days_in_leap_years_between(
start_date, end_date
)
```
'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: 366 days in 2020, 31 in Jan 2024 and 9 in Feb 2024.
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:
Tensor of type 'int32'.