There is one solution .. but it is slightly tedious (and you need to know a lil bit of excel)
Here are the steps:
1. Goto
Reliance Netconnect
2. Enter your details and login
3. Click "Usage Log"
4. Enter the dates and in Request type click "View on screen"
5. Now open
Microsoft Excel (or any spreadsheet) in the background
6. Use your mouse and 'copy' the table of data and Paste it into Excel
7. Click next and repeat step 6 ...and so on.
8. In excel:
a. Select all -- Goto Format Cells -> number -> Number --> No of decimal places --> select zero. (this step is optional, but recommended)
b. De-select all
c. Delete all the columns except 'Start Time' and 'Total Data Transferred(KBs)'
d. Select all the data
e. Sort the data alphabetically (Goto Menu--> Data --> Sort --> Sort by (Start Time)
f. Once it is sorted then separate the rows with the start time > 22:00 hrs and < 0900 hrs and get separate totals for day usage and night usage.
g. The result is quite accurate if you do the above correctly.
PHEW ! it took a while to type this thing !