As per Rule 30 of Income Tax Rules, Due date to deposit the TDS deducted on amount paid during the March 2015 and TDS deducted on provisions created in March 2015 is 30.04.2015.
This is as per amendment in rule 30 vide notification 41/2010 dated 31.05.2010.(link to download given at the end)
So no need to deposit TDS on 07.04.2015 and enjoy interest free amount for few more days and deposit TDS for March ,2015 on or before 30.04.2015.
Please note the following FAQ also
Ques :Whether this due date(30.04.2015) for March 2015 is applicable on all the deduction made in March ,15 or only on Tax deducted on Last day of the Financial year 31.03.2015 on provisions ?
Ans : Same due date (30.04.2015) is applicable for complete month of March ,2015 ,means whether tax deducted on 31.03.2015 on provisions or deducted on payments between 01.03.2015 to 30.03.2015 ,Due date remains the same 30.