Dual boot timestamps differ

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Dual boot linux/windows users may want to change the timestamp seconds delimiter to work with both systems, rather than either. (Windows does not allow a colon so we change it to an underline, and we keep the colon in linux for improved readability.)

Author's note: I don't do development in windows anymore, so don't feel the need to make it work 100% dual boot safe. So long as it works in linux and windows, that is good enough for me.) Therefore a fix is not planned for this.