BUG? _dcf_actacticma with leap year

[shh6242]

Bill.dcf attribute throws large dcf years when using convention ActActICMA.
I think the problem is the effective date of 29th Feb 2024.

Could you please see if _dcf_actacticma working well for the leap year?

Replicate code as below,

from rateslib import Bill
from datetime import datetime as dt

bill_actacticma = Bill(
    effective= dt(2024, 2, 29),
    termination= dt(2024, 5, 29),   # 90 calendar days
    modifier='NONE',
    calendar= 'bus',
    payment_lag= 0,
    notional=-1000000,
    currency='usd',
    convention='ACTACTICMA',        
    settle=0, 
    calc_mode='ustb', 
)

bill_act360 = Bill(
    effective= dt(2024, 2, 29),
    termination= dt(2024, 5, 29),   # 90 calendar days
    modifier='NONE',
    calendar= 'bus',
    payment_lag= 0,
    notional=-1000000,
    currency='usd',
    convention='ACT360',        
    settle=0, 
    calc_mode='ustb', 
)

print(bill_actacticma.dcf)  # 8333333.333333333
print(bill_act360.dcf)        # 0.25

thank you.

[attack68]

Actually the problem here is that Bill is created with a default frequency of "Z". It is only ever a single period.
You will probably get the same problem with any Bill that uses ActActICMA.

The DCF "ActActICMA" requires a known frequency to define a regular period. In your case this is obviously 3 months so the DCF should be 0.25.

However, it is unclear to me what to do here.
What if you defined a 4month or 9month ActActICMA Bill, what should be the result?

[attack68]

#147 looks to handle this. But its still not clear what to do, but now at least the User is better informed.

[shh6242]

Thanks for reply:)

What do you think about telling the user for bill that frequency would be forced into 'z'? I think the doc string is redundant which says:
instruments.p line 2796
frequency : str in {"M", "B", "Q", "T", "S", "A"}, optional
The frequency of the schedule. "Z" is not permitted.

Bur in the end Bill instance always have frequency of 'z'.