fix conversion to date time, framework upgrades, fields made readonly

[jhorv-scs]

• Made all fields readonly that could be.
• Made all projects framework v. 4.5 - was a mixture of 2, 4, 4.5
• One minor fix on storing Entry time as UTC.

[yyoon]

These changes all look good to me. I'll test your changes locally when I have time and merge them in soon. Thanks for your contribution!