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title: "FIX 5.0 SP2 EP299: LegPaymentStreamFirstObservationDateOffsetPeriod <41580> field – FIX Dictionary – Onix Solutions"
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# LegPaymentStreamFirstObservationDateOffsetPeriod <41580> field

## FIX 5.0 SP2 EP299

### Description

 Type: [int](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/index.html#int)

 Time unit multiplier for the relative first observation date offset.

 If the first observation offset is specified, the observation period will start the specified interval prior to each calculation period - i.e. if the first observation offset is 4 months and the lag duration is 3 months, observations will be taken in months 4, 3 and 2 (but not 1) prior to each calculation period. If no first observation offset is specified, the observation period will end immediately preceding each calculation period.

### Used In

- [<LegPaymentStreamFloatingRate>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_LegPaymentStreamFloatingRate.html)

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