Is making a commitment to give charity of a specific amount on a specific day an innovation?

Singling out a particular time or place
for doing an act of worship that is not prescribed in any Islamic text,
without believing that that time or place has a particular virtue – rather
it is something dictated by circumstances, so that he needed to do it in
that particular time or place – has nothing to do with innovation at all,
and there is nothing wrong with it. Rather innovation or introducing things
into the religion refers to cases where the aim is to add this innovation to
the teachings and prescriptions of Islam, or where that is the likely
outcome; in that case the Muslim has fallen into innovation.

Dr. Muhammad Husayn al-Jeezaani (may Allah
preserve him) said:

There are three characteristics of
religious innovation by which it is known to be such. A thing is not
regarded as innovation in religious terms unless it meets these three
conditions. They are:

1.Being newly invented

2.This newly invented matter begins to be
regarded as being part of the religion

3.This newly invented matter has no basis in
Islamic teachings, either in a general or specific sense.

A particular practice may be regarded as
an innovation when one of the following three things applies:

1.The practice is aimed at drawing close to Allah
by means of something that He has not prescribed

2.The practice drifts away from the general
guidelines of the religion

3.The practice may lead to innovation.

End quote from Qawaa‘id Ma‘rifat
al-Bida‘ (p. 18-23)

But as for doing a particular act of
worship regularly, at a specific time or in a specific place because
circumstances allow doing it at that time or in that place, without
believing that one must do it then or that there is some special virtue in
doing so, there is nothing wrong with that – as in the case of one who fasts
on Tuesdays, for example, because that is his day off work; or one who
regularly prays qiyaam on Friday night, because he is off work on Saturday;
or one who regularly reads Qur’an between Maghrib and ‘Isha’, because he has
free time then; and there are many similar examples. All of that is
permissible, because no innovation is being introduced into the religion in
these cases, and it is not something that could lead to the introduction of
new innovations.

Shaykh Ibn Baaz (may Allah have mercy on
him) was asked:

What is your opinion on what some imams do
of specifying a particular portion of Quran for every rak‘ah and every
night?

He replied:

I do not see anything wrong with that,
because the matter depends on what the imam sees fit. If he thinks that it
serves a purpose to increase the portion on some nights or in some rak‘ahs,
because he feels more energetic and thinks that he is able to do that, and
he sees that he is enjoying the recitation, so he increases the number of
verses in order to benefit himself and benefit those who are praying behind
him, so if he beautifies his voice and begins to enjoy the recitation, and
he feels focused, then he and those who are praying behind him will benefit.
So if he adds more verses in some rak‘ahs, or on some nights, we do not
think there is anything wrong with it. The matter is flexible, praise be to
Allah, may He be exalted. End quote.

Majmoo‘ al-Fataawa
(11/335)

Based on that, we do not see anything
wrong with giving charity regularly on a particular day because
circumstances allow that, to the exclusion of other days, and not because
one believes that there is a particular virtue in doing that on that day.

And Allah knows best.