If 30th January 2003 was Thursday, what was the day of 2nd March 2003?

Starting date: 30th January 2003 is Thursday

Target date: 2nd March 2003

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Days remaining in January after 30th:

31st January = 1 day

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Days in February 2003:

2003 is not a leap year (not divisible by 4)

February 2003 has 28 days

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Days in March up to 2nd:

1st March and 2nd March = 2 days

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Total number of days from 30th January to 2nd March:

$= 1 + 28 + 2$

$= 31$ days

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$31$ days $= 4$ weeks $+ 3$ days

$= 28 + 3$ days

After 4 complete weeks (28 days), the day remains Thursday.

Adding 3 more days:

Thursday $+1$ day $=$ Friday

Friday $+1$ day $=$ Saturday

Saturday $+1$ day $=$ Sunday

Therefore, 2nd March 2003 was Sunday.