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for Hdate in Hdate-list
     your-s2S-request(Hdate)

for each Hdate from 2010-03-01 to 2010-03-31
    call your-s2ss2S-request(Hdate) 

The best approach is to iterate over the Hyears you wish. For each Hyear iterate over all Hmonths and for each Hmonth iterate over all its Hdays.

for Hyear in Hyears 
    for Hmonth in Hyear
        for Hdays in Hmonth
             Hdate = Hyear-Hmonth-Hday

                 your-s2S-request(Hdate)

for Hyear in Hyears 
    for Hmonth in Hyear
        for Hdays in Hmonth

             Hdate = Hyear-Hmonth-Hday

             your-S2Ss2S-request(Hdate)

for each Hyear from 2010 to 2014

    for Hmonth in April, June

        for Hday in Hmonth

             Hdate = Hyear-Hmonth-Hday

             your-S2Ss2S-request(Hdate)