Newer than C99? Both the Linux kernel and systemd build with gnu11. I’d call those pretty relevant.

C23 is still far too new (still a draft) for any major projects that care about compiler compatibility.

That’s strange. As far as I can tell from any web searches, every version Windows still defaults to storing local time to the hardware clock and there are no reports of that changing with an update, nor is there any exposed setting control to configure this behavior outside of regedit. If you’re curious enough, you can check the current setting in the registry at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation. Windows maintains the current time as UTC if and only if the RealTimeIsUniversal key is present and nonzero.

I expect it’s more likely some other issue would make the BIOS display an hour that’s inconsistent with your local timezone. For example, maybe a bug in the BIOS, maybe a timezone offset setting within the BIOS, or maybe a dead clock battery.

Unix time is far less universal in computing than you might hope. A few exceptions I’m aware of:

• Most real-time clock hardware stores datetime as separate binary-coded decimal fields representing months, days, hours, minutes, and seconds as one byte each, and often the year too (resulting in a year 2100 limit).
• Python’s datetime, WIN32’s SYSTEMTIME, Java’s LocalDateTime, and MySQL’s DATETIME similarly have separate attributes for year, month, day, etc.
• NTFS stores a 64-bit number representing time elapsed since the year 1601 in 100-nanosecond resolution for things like file creation time.
• NTP uses an epoch of midnight 1900-01-01 with unsigned seconds elapsed and an unusual base-2 fractional part
• GPS uses an epoch of midnight 1980-01-06 with a week number and time within the week as separate values.

Converting between time formats is a common source of bugs and each one will overflow in different ways. A time value might overflow in the year 2036, 2038, 2070, 2100, 2156, or 9999.

Also, Unix time is often managed with a separate nanoseconds component for increased resolution. Like in C struct timespec, modern *nix filesystems like ext4/xfs/btrfs/zfs, etc.

as soon as the BIOS loaded and showed the time, it was “wrong” because it was in UTC

Because you don’t use Windows. Windows by default stores local time, not UTC, to the RTC. This behavior can be overriden with a registry tweak. Some Linux distro installer disks (at least Ubuntu and Fedora, maybe others) will try to detect if your system has an existing Windows install and mimicks this behavior if one exists (equivalent to timedatectl set-local-rtc 1) and otherwise defaults to storing UTC, which is the more sane choice.

Storing localtime on a computer that has more than one bootable OS becomes a particularly noticable problem in regions that observe DST, because each OS will try to change the RTC by one hour on its first boot after the time change.

I had assumed their reasoning for not taking that approach might be related to metadata at rest, but it seems they don’t use “zero access” encryption for metadata even at rest so I have no idea what technical justification they could have for not supporting IMAP with PGP handled by the email client. The fact that they restrict bridge access to paying subscribers only doesn’t help them avoid lock-in impressions either.

I’m not sure if this is required. Any decent e-mail server uses TLS to communicate these days, so everything in transit is already encrypted.

In transit, yes, but not end-to-end.

One feature that Proton advertises: when you send an email from one Proton mail account to another Proton address, the message is automatically encrypted such that (assuming you trust their client-side code for webmail/bridge) Proton’s servers never have access to the message contents for even a moment. When incoming mail hits Proton’s SMTP server, Proton technically could (but claims not to) log the unencrypted message contents before encrypting it with the recipient’s public key and storing it. That undermines Proton’s promise of Proton not having access to your emails. If both parties involved in an email conversation agree to use PGP encryption then they could avoid that risk, and no mail server on either end would have access to anything more than metadata and the initial exchange of public keys, but most humans won’t bother doing that key exchange and almost no automated mailers would.

Some standard way of automatically asking a mail server “Does user@proton.me have a PGP public key?” would help on this front as long as the server doesn’t reject senders who ignore this feature and send SMTP/TLS as normal without PGP. This still requires trusting that the server doesn’t give an incorrect public key but any suspicious behavior on this front would be very noticeable in a way that server-side logging would not be. Users who deem that unacceptable can still use a separate set of PGP keys.

They say the reason for needing their bridge is the encryption at rest, but I feel like the better way to handle wanting to push email privacy forward would be to publish (or better yet coordinate with other groups on drafting) a public standard that both clients and competing email servers could adopt for an email syncing protocol for that sort of zero-access encryption that requires users give their client a key file. A bridge would be easier to swallow as a fallback option until there’s wider client support rather than as the only way.

A similar standard for server-to-server communication, like for automatic pgp key negotiation, would be nice too.

Still, Proton has a easy to access data export that doesn’t require a bridge client or subscription or anything. I think that’s required by GDPR. It’s manual enough to not be an effective way to keep up-to-date backups in case you ever abruptly lose access but it’s good enough to handle wanting to migrate to another provider.

Compared to simplelogin (or proton pass aliases, addy, firefox relay, etc), one other downside of a catchall is in associations across accounts. Registering with a @passmail.net address implies that I use Proton; registering with random-string@mydomain.org implies I have access to that domain. If 10 data breach leaks have exactly one account matching the latter pattern then that’s a strong sign the domain isn’t shared. If one breached site has my mailing address, my real identity can be tied to all the others.