CalcCellValue does not handle dates

[stanim]

date.zip
Description

CalcCellValue treats dates as strings. As a consequence CalcCellValue is unable to process dates in formulas:

• mathemical expressions give parsing error
• comparison fails: "19-08-2021" > "20-07-2022", but should be the opposite

Steps to reproduce the issue:

1. Download date.zip and unzip it
2. Run the go file: go run ./date.go

Describe the results you received:

> go run ./date.go

date.xlsx
Sheet1!C2: error: strconv.ParseFloat: parsing "03/08/21": invalid syntax
Sheet1!C3: error: strconv.ParseFloat: parsing "19/08/21": invalid syntax

Describe the results you expected:

> go run ./date.go

date.xlsx
Sheet1!C2: sucess: "05-08-21"
Sheet1!C3: should be true: "true"

Output of go version:

go version go1.16.7 linux/amd64

Excelize version or commit ID:

> git log
commit a55f354eb3d0c6c1b9a543ff8ff98227aa6063a6 (HEAD -> lookup, origin/master, origin/HEAD, master)
Author: xuri <xuri.me@gmail.com>
Date:   Tue Aug 17 00:01:44 2021 +0800

    This closes #989, closes #990
    
    New API: `SetRowStyle` support for set style for the rows
    Update documentation for the `GetRows`, `SetCellStyle` and `SetColStyle`

Environment details (OS, Microsoft Excel™ version, physical, etc.):

• OS: Archlinux 5.13.10-arch1-1
• WPS Spreadsheets (version wps-office 11.1.0.10702-1)
• LibreCalc (version libreoffice-fresh 7.1.5-2)

[xuri]

Thanks for your issue, I have added text comparison support, please try to upgrade to the master branch.