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How to find the most dominant frequency(ies) of time series that include datetime ?

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How can I find the most dominant frequency(ies) of this time series that includes datetime ?
a = {
'17-Jun-2021 12:00:00', 25
'18-Jun-2021 20:00:00', 21
'19-Jun-2021 06:00:00', 31
'20-Jun-2021 14:00:00', 35
'21-Jun-2021 17:00:00', 31
'22-Jun-2021 16:00:00', 41
'23-Jun-2021 16:00:00', 22
'24-Jun-2021 13:00:00', 22
'25-Jun-2021 15:00:00', 45
'26-Jun-2021 11:00:00', 20
'27-Jun-2021 19:00:00', 25
'28-Jun-2021 18:00:00', 25
'29-Jun-2021 15:00:00', 29
'30-Jun-2021 10:00:00', 31
'01-Jul-2021 15:00:00', 20
'02-Jul-2021 10:00:00', 28
'03-Jul-2021 14:00:00', 31
'04-Jul-2021 13:00:00', 24
'05-Jul-2021 09:00:00', 24
'06-Jul-2021 14:00:00', 25
'07-Jul-2021 15:00:00', 40}
plot(datetime(a(:,1)),cell2mat(a(:,2)))
I guess this might be possible either with fft or pspectrum, or other tools, but how ?

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