<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000701939
<NAME> SEI DAILY INCOME TRUST
<SERIES>
<NUMBER> 122
<NAME> TREASURY II CLASS C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-2000
<PERIOD-START> FEB-01-2000
<PERIOD-END> JUL-31-2000
<INVESTMENTS-AT-COST> 521471
<INVESTMENTS-AT-VALUE> 521471
<RECEIVABLES> 1422
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 522897
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 11459
<TOTAL-LIABILITIES> 11459
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 511446
<SHARES-COMMON-STOCK> 77822
<SHARES-COMMON-PRIOR> 34415
<ACCUMULATED-NII-CURRENT> 208
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (216)
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 511438
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 14861
<OTHER-INCOME> 0
<EXPENSES-NET> (893)
<NET-INVESTMENT-INCOME> 13968
<REALIZED-GAINS-CURRENT> 19
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 13987
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1225)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 229973
<NUMBER-OF-SHARES-REDEEMED> (186566)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 43407
<ACCUMULATED-NII-PRIOR> 209
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (235)
<GROSS-ADVISORY-FEES> 60
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1487
<AVERAGE-NET-ASSETS> 521870
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.75
</TABLE>