It looks like you have forgotten to attach the link! But I looked it up in wikipedia and am pasting the paragraph about it here:

[quote]The date of independence

Since the power of transfer took place on the midnight of 14 and 15 August, the Indian Independence Act 1947 recognised 15 August as the birthday of both Pakistan and India. The act states;[18]

"As from the fifteenth day of August, nineteen hundred and forty-seven, two independent Dominions shall be set up in India, to be known respectively as India and Pakistan."

Jinnah in his first broadcast to the nation stated;[19]

"August 15 is the birthday of the independent and sovereign state of Pakistan. It marks the fulfilment of the destiny of the Muslim nation which made great sacrifices in the past few years to have its homeland."

It was on 15 August that the nation celebrated its birthday, however in subsequent years 14 August was marked as the independence day.[20] The first commemorative postage stamps of the country, released in July 1948, also gave 15 August 1947 as the independence day.[21] The night of 14-15 August 1947 coincided with 27 Ramadan 1366 of the Islamic calendar, which Muslims regard as a sacred night.[22][23]

It looks like you have forgotten to attach the link! But I looked it up in wikipedia and am pasting the paragraph about it here:

[quote]The date of independence

Since the power of transfer took place on the midnight of 14 and 15 August, the Indian Independence Act 1947 recognised 15 August as the birthday of both Pakistan and India. The act states;[18]

"As from the fifteenth day of August, nineteen hundred and forty-seven, two independent Dominions shall be set up in India, to be known respectively as India and Pakistan."

Jinnah in his first broadcast to the nation stated;[19]

"August 15 is the birthday of the independent and sovereign state of Pakistan. It marks the fulfilment of the destiny of the Muslim nation which made great sacrifices in the past few years to have its homeland."

It was on 15 August that the nation celebrated its birthday, however in subsequent years 14 August was marked as the independence day.[20] The first commemorative postage stamps of the country, released in July 1948, also gave 15 August 1947 as the independence day.[21] The night of 14-15 August 1947 coincided with 27 Ramadan 1366 of the Islamic calendar, which Muslims regard as a sacred night.[22][23]

It looks like you have forgotten to attach the link! But I looked it up in wikipedia and am pasting the paragraph about it here:

[quote]The date of independence

Since the power of transfer took place on the midnight of 14 and 15 August, the Indian Independence Act 1947 recognised 15 August as the birthday of both Pakistan and India. The act states;[18]

"As from the fifteenth day of August, nineteen hundred and forty-seven, two independent Dominions shall be set up in India, to be known respectively as India and Pakistan."

Jinnah in his first broadcast to the nation stated;[19]

"August 15 is the birthday of the independent and sovereign state of Pakistan. It marks the fulfilment of the destiny of the Muslim nation which made great sacrifices in the past few years to have its homeland."

It was on 15 August that the nation celebrated its birthday, however in subsequent years 14 August was marked as the independence day.[20] The first commemorative postage stamps of the country, released in July 1948, also gave 15 August 1947 as the independence day.[21] The night of 14-15 August 1947 coincided with 27 Ramadan 1366 of the Islamic calendar, which Muslims regard as a sacred night.[22][23]

So actually it was 15th August but somehow got changed to 14th, most probably because they do not want to share their independence day celebration with India!