Addition

https://h.api.crmls.org/RESO/OData/OpenHouse?$filter=(OpenHouseEndTime+add+1200)+le+2400

Subtraction

https://h.api.crmls.org/RESO/OData/OpenHouse?$filter=(OpenHouseEndTime+sub+1200)+le+0

Division

https://h.api.crmls.org/RESO/OData/OpenHouse?$filter=(OpenHouseEndTime+div+100)+le+24

Multiplication

https://h.api.crmls.org/RESO/OData/OpenHouse?$filter=(24+mul+100)+ge+OpenHouseEndTime

Modulo

https://h.api.crmls.org/RESO/OData/OpenHouse?$filter=(OpenHouseEndTime+mod+100)+le+5