I cannot understand this. I tried it myself with the following steps and it works:
@PiriReis: If you follow these steps, it works.
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Open 5 S2 images in SNAP
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Test the time-series tool for band 3
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it works
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Calculate index (I used the VI [NIR/Red] for the sake of simplicity) for each band
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band in stack
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Right-click on new band and click ‘convert band’ so it becomes permanent
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Save all products (this takes time because the whole products are written into a DIMAP format)
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Close all products and open again. Clear the time-series tool and insert the products again. The dates are still there.
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Select the VI in the filter tab
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Display VI series in the plot (note the tab says “VI” and the scale ranges from 0-30)