Pedigree Forge supports dates in the Hebrew calendar, entered with the HE suffix:
20 Csh 5636 HE
The HE suffix is optional — Hebrew dates are recognised by their month names.
The month abbreviations are: Nsn, Iyr, Svn, Tmz, Aav, Ell, Tsh, Csh, Ksl, Tvt, Shv, Adr, Ads.
Note — Hebrew dates are imported and exported in GEDCOM using the @#DHEBREW@ escape (HEBREW in version 7.0).